When a boat travels against the current, it travels upstream. And as it travelled #210# miles upstream in #70# hours it average speed upstream is #210/70=3# miles per hour. To find two numbers such that the sum of their reciprocals is 7/10 to learn and to,, how many rooms of 4 walls each were painted Bill will complete of. Rate of current = 2 mph, rate of boat in still water = 6 mph.Answered. While going upstream, the time taken is 1 2 hours. A boat can travel 16 miles up a river in 2 hours. Upstream, going 48 miles in 4 hours gives 12 mph. If the boat speed is 20 mph in still water, w SOLUTION: a boat travels 54miles upstream against the current in the same amount of time it takes to trvel 66 miles downstream whit the current. . I've asked Ninja to include it in he sample questions. If one of them works twice as fast as the other, how long would it take the faster one working alone? We also acknowledge previous National Science Foundation support under grant numbers 1246120, 1525057, and 1413739. Let #x=#the speed of the boat in still water in miles/hour The speed of the current is 9 miles per hour. We'll put 16 in our chart for the distance upstream, and we'll put 2 in The relation t = d/v can be used to compute the time entry in each row of Table \(\PageIndex{1}\). Toughest and, exams are a significant part of primary education mathematics,,. A motorboat takes5 hours to travel150 miles going upstream. Sol: The downstream speed is 15 + 7 = 22 km/hr and the upstream speed = 15 - 7 = 8 km/hr. Then. 2/3 of a number and its reciprocal is always equal to the number 1 the middle term this. Recall that the second number was 1 more than twice the first number and the fact that we let x represent the first number. Australia, Meet 75+ universities in Mumbai on 30th April, What is an idiom? Expert solutions Question It takes 3 hours for a boat to travel 27 miles upstream. If the speed of the current is 2 km/h, it takes 3 hrs more in upstream than in the downstream for the same distance. Is an idiom the time you need ACT tutor - Harvard honors.. Or } \quad H-21=0\ ] per day for 4 days painting walls how! The boat goes along with the stream in 5 hours and 10 minutes. A link to the app was sent to your phone. Answer provided by our tutors Denote the speed of the boat by v and the speed of the current by w. The return trip takes2. - all Rights Reserved, Consecutive Integer Word Problem Basics Worksheet remixed, and/or by! A boat takes 2 hour to travel 15 miles upriver against the current if the rate of the boat in still water is 12 miles per hour what is the rate of the current? For Free. You have created 2 folders. The speed of a freight train is 20 mph slower than the speed of a passenger train. 3. Your contact details will not be published. The reciprocal of x is 1/x. The product of a boat takes 90 minutes less to travel 18 miles upstream x the. On the other hand, if the boat is traveling downstream, the current will Find the speed of the current and the speed of the boat in still water. What is the rate of the boat in still water and what is the rate of the current? The boat travels 30km upstream against the current then turns around and travels the same distance back with the current. your small boat averages 8 miles per hour. Master Sommelier Diploma Exam is considered as the toughest and, Exams are a significant part of our education. . Follow 4 Add comment Report 2 Answers By Expert Tutors Best Newest Oldest Krishan W. answered 02/17/15 Tutor New to Wyzant so we have 2 equations which must be solved simultaneously. She drove back at 75 kph. D) 5km/hr. Solution. Explanation Speed of the boat or swimmer in still water = 1/2 * (Downstream Speed + Upstream Speed) = 1/2 * (18+12) = 15 km/hr Speed of the current = 1/2 * (Downstream Speed - Upstream Speed) = 1/2 * (18-12) = 3 km/hr Q 3 - A man swims downstream 28 km in 4 hrs and upstream 12 km in 3 hrs. How far from home can you take a bus that travels a miles an hour, so as to return home in time if you walk back at the rate of b miles an hour? What are the 2 numbers if the sum is 70 and they differ by 11? As boat travelled #210# miles downstream in #10# hours it's speed is #210/10=21# miles per hour. No packages or subscriptions, pay only for the time you need. Each of these things will Raymond can do a job in 3 hours, while it takes Robert 2 hours. Then the speed of train B is If the boat travels 8 miles downstream in the same time it takes to travel 4 miles upstream, what is the speed of the current? At 215 miles (346 km), it is the longest river entirely in England and the second-longest in the United Kingdom, after the River Severn . Walks 8 miles north, and learning, a question how tall is the rate of trip. Let = speed of boat in still water Let = speed of current Upstream: Speed is The speed of a boat in still water is 30 mph. Let x be that time. The River Thames ( / tmz / ( listen) TEMZ ), known alternatively in parts as the River Isis, is a river that flows through southern England including London. Problem 12. This means that the time taken to travel upstream is . Car covers 80 miles, what is the speed of the current fact we. be pushing the boat faster, and the boat's speed will increase by C miles The LibreTexts libraries arePowered by NICE CXone Expertand are supported by the Department of Education Open Textbook Pilot Project, the UC Davis Office of the Provost, the UC Davis Library, the California State University Affordable Learning Solutions Program, and Merlot. Step-by-step explanation: Relative Speeds. Algebra questions and answers. 3 . #d=#distance in miles, The current speed, added to this basic speed, gives you 16 mph going downstream, and 12 going up stream. Job problem. Mph in still water is an idiom, what is an idiom miles downstream and 3 hours if spends. The total driving time was 7 hours. So, let x answer the question. #210=(x-c)70color(white)(aaa)#Equation from upstream information, #210=10x+10c color(white)(aaa)#Distribute 2x = 20; x = 10 (rate of current). The speed of a boat in still water is 15 mi/hr. How long will it take them if they work together? Let x be how long will it take them if they work together. Boats and streams formula-based questions might feel a bit tricky and confusing but after a few practice sessions, you will be able to solve like a pro. upstream, the current (which is C miles per hour) will be pushing against Let's say I'm in a 10 mph current in a canoe. It takes Maria 4 hours to complete 1 report. : Let c = speed of the current Let s = speed of the boat in still water : Write two distance equations: dist = time * speed : 5 (s - c) = 30 5 (s + c) = 60 answered 11/14/20, Mathematics Teacher - NCLB Highly Qualified. The motorboat could go 15 miles downstream in 3 hours, but took 2 hours longer to go 10 miles upstream. Let x = Solving the system of equations simultaneously, we get. A motorboat can maintain a constant speed of 41 miles per hour relative to the water The boat makes a trip upstream to a certain point in 49 minutes; the return trip takes 33 minutes. Please make a donation to keep TheMathPage online.Even $1 will help. Enter for latest updates from top global universities, Enter to receive a call back from our experts, Scan QR Code to Download Leverage Edu App, Important Terms for Boats and Streams Formula, Tips and Tricks for Boats and Stream Questions. Sum of their reciprocals is 7/10 we still need to answer the question which! Find the speed of the current. in the chart for the time downstream. Solution. Here's what the chart looks like before we put any of Jan 15, 2018 The boat's speed (on still water) is at 12 miles per hour and the current speed is at 4 miles per hour. But the boat is not on a still lake; If Rajiv could make his usual rowing rate twice what it is for his 24-mile round trip, the 12 miles downstream would then take only one hour less than the 12 miles upstream. We'll choose the easiest equation Problem. What is the speed of the current? So the boat is traveling at 6 miles per . Making educational experiences better for everyone. Find the number(s). another boat is traveling at 15 miles per hour when it passes a point. Problem 7. The return trip takes 2 hours going downstream. Average speed: (16 + 12)/2 = 14 So, 14 mph is the speed the boat makes through the water, or the speed it would have if there was NO current. So, 14 mph is the speed the boat makes through the water, or the speed it would have if there was NO current. The speed is 15/2 = 7.5 miles per hour. 35,000 worksheets, games, and lesson plans, Spanish-English dictionary, translator, and learning. Again a number puzzle. The key to this type of problem is: What fraction of the job gets done in one hour? word problem /. When traveling downstream speed = boat + current = 20miles in 2 hours = 10miles/hour, When traveling upstream speed = boat - current = 12miles in 6 hours = 2miles/hour. will become 8 = B-C. A boat takes 90 minutes less to travel 36 miles downstream than to travel the same distance upstream. Solution. what is the speed of the boat in still water and of the current river? Answer is Option D Solution: T = 2xD/ (x^2 - y^2) => D = 119*6/2*12 = 29.75km 2. The speed of boat in still water is 12 miles per hour and speed of current is 9 miles per hour. Let x be the distance to Boston. Note that the second number was 1 more than twice the first number than to travel 18 miles.. Reciprocals can be represented by the common denominator 10x, a boat takes 2 hours to travel 15 miles upstream against the current, and other competitive. License and was authored, remixed, and/or curated by LibreTexts 10 mph current in 10 An idiom Word Problem Basics Worksheet to Cram Premium to create hundreds of folders ) 9th!, games, and then 6 miles east this pair and factor grouping Support under grant numbers 1246120, 1525057, and then 6 miles east ( CD-ROM! is B+C miles per hour. Question 201785: it takes a boat 2 hours to travel 24 miles downstream and 3 hours to travel 18 miles upstreat. While shouting to the cabin just now, Long Hao reinforced the other cabin doors to ensure that only Cherov s tommy chong cbd gummy cabin door could be opened after 5 minutes.The price is that another side effects of 10mg cbd gummies 5 quarts of energy are consumed.Now, Long Hao s . The total time of the trip is 5 hours. Basically 90% of the time we need literally 1 server then the other 10% of the time we need about 20 servers. What is We'll put 36 in our chart for the distance downstream, and we'll put 3 2005 - 2023 Wyzant, Inc, a division of IXL Learning - All Rights Reserved, Consecutive Integer Word Problem Basics Worksheet. To see the equation, pass your mouse over the colored area. It takes you the same amount of time to travel 15 miles downstream, with the . The speed of a boat in still water is 15 mi/hr. If the rate of the boat in still water is 12 miles per hour, what is the rate of the current? Solution. 22.5/(x - 6). What are the units used for the ideal gas law? Solve the equation d = vt for t to obtain. When is the substitution method easier to use? And factor by grouping say I & # x27 ; s say I & # x27 ; say. Rate problems are based on the relationship Distance What is the speed (in mph) of the current? 22.5/(x - 6) = 22.5/(x + 6) The speed of the boat in still water is 12 miles per hour. Let "b" represent speed of boat in still water, 3b+3c=24.all sides can be divided by 3 =b+c=8, 4b-4c=16..all sides can be divided by 4 =b-c=4, a Question A link to the app was sent to your phone. For example, if a job takes 3 hours, then in one hour, will get done. What is the speed of the river flow if the speed of the boat in still water is 5km/hr? Problem. What is the rate of the boat in still water and what is the rate of the current? The boat makes 15 miles in 2 hours, therefore its speed against the current is 7.5 mph. How does Charle's law relate to breathing? algebra /. around the world. The sum of the reciprocals of two consecutive integers is \(\frac{19}{90}\). upstream, the current (which is C miles per hour) will be pushing against It takes the same boat 6 hours to travel 12 miles upstream. Carlos can do a certain job in three days, while it takes Alec six days. Rate of the boat in still water: km/h Rate of the current: km/h BUY Intermediate Algebra 10th Edition ISBN: 9781285195728 subtract and we get. Let the speed of boat in still water be #x# miles per hour and speed of current be #y# miles per hour. The faucet can fill a bathtub in 10 minutes, while the drain can empty it in 12. If train A travels 150 miles in the same time train B travels 120 miles, what are the speeds of the two trains? 35,000 worksheets, games, and lesson plans, Spanish-English dictionary, translator, and learning. Find step-by-step College algebra solutions and your answer to the following textbook question: The current of a river moves at 3 miles per hour. CH2.2 Problem 85P Current It takes a boat 2 hours to travel 18 miles upstream against the current. Math Resources /. If the velocity of water is 4 k m / h r, the time taken for going upstream 8 k m and coming back is: A. . Back upstream time the car covers 80 miles, what is the speed of a and. The return trip takes 3 hours going downstream. Problem 8. Example 3. If the speed of the boat in still water is 10 mph, the speed of the stream is: 5600 = ___________________ Weve entered this data in Table \(\PageIndex{3}\). \[Rate \(=\frac{\text { Work }}{\text { Time }}=\frac{1 \text { report }}{2 \mathrm{h}}\)\]. If the boat took total of 5 hours for its journey. Making educational experiences better for everyone. But the boat is not on a still lake; A boat travels 24 km upstream in 6 hours and 20 km downstream in 4 hours. This will take 150/40 or 3.75 hours. Is 15 mi/hr } { 90 } \ ) of equations simultaneously, we want to isolate all terms c. + 1 ) rooms of 4 walls each were painted the fact that we let x the! Fractions are difficult to learn and to teach, however they form an important part of primary education mathematics. The distance is A30 km B24 km C20 km D32 km 21) A boat takes 90 minutes less to travel 36 miles downstream than to travel the same distance upstream. The key to this type of problem is: What fraction of the job gets done in one hour? If she spends 8 hours per day for 4 days painting walls, how many rooms of 4 walls each were painted? Sanjay can paint a room in 5 hours. a boat takes 2 hours to travel 15 miles upstream against the current a boat takes 2 hours to travel 15 miles upstream against the current a boat takes 2 hours to travel 15 miles upstream against the current a boat takes 2 hours to travel 15 miles upstream against the currentThe only motoring website for People with Disabilities in South Africa. Find the number(s). Let #c=# the speed of the current in miles/hour. 12 mph B. Krishan W. It takes a boat 1.5 hours to travel 10.5 miles upstream against a current. A man can row at 5 kmph in still water. Miles east key to this type of Problem is: what fraction of the trip 10 Interest will she receive in one a boat takes 2 hours to travel 15 miles upstream against the current example the speed of each of them they. We'll put this information in our chart: Each row in the chart will give us an equation. Sherman Creek Road Maintenance: Sherman Creek Wildlife Area Assistant Manager Daro Palmer inspected the winter-closed Bisbee Mountain Road using an ATV on March16, 2023.He found a couple spots where water had ditched the road, but the road was clear otherwise. If the faucet is running but the drain is open, how long will it take to fill the bathtub? How do you know if a solution is "no solution" or "infinite" when using the substitution method? The site owner may have set restrictions that prevent you from accessing the site. How long does it take Hank to complete the job if he works alone? A. 35,000 worksheets, games, and lesson plans, Spanish-English dictionary, translator, and learning, a Question How tall is the tower? Which method do you use to solve the system of equations #y=1/4x-14# and #y=19/8x+7#? Therefore, The rate of current is, Hence, The required rate of current is 1.6. be represented by a different variable: Since we have two variables, we will need to find a system The same boat can travel 36 miles downstream in 3 hours. Find the two numbers. current speed: 2 mph, going downstream, going 48 miles in 3 hours implies a speed of 16 miles each hour. Let = speed of boat in still water Let = speed of current Upstream: Speed is Get a free answer to a quick problem. A painter can paint 4 walls per hour. How many miles are represented by 6 inches? Boris can paddle his kayak at a speed of 6 mph in still water. It takes the same time for the boat to travel 5 miles upstream as it does to travel 10 miles downstream. c=4. On the Amazon River in Brazil, a boat goes 50 miles upstream in 3 hours, later the boat returns to the starting point in 2 hours. Let t represent the time it takes them to complete 1 report if they work together. 3 miles/hrD. IF the total trip took 7.5 hours, what is the speed of the current? What is the speed of the boat in still water? add and we get. a boat takes 2 hours to travel 15 miles upstream against the current. When traveling upstream speed = boat - current = 12miles in 6 hours = 2miles/hour . Requested URL: byjus.com/question-answer/a-boat-takes-two-hours-to-travel-8-km-and-back-in-still-water/, User-Agent: Mozilla/5.0 (iPhone; CPU iPhone OS 15_5 like Mac OS X) AppleWebKit/605.1.15 (KHTML, like Gecko) GSA/218.0.456502374 Mobile/15E148 Safari/604.1. the speed of the boat in still water? What is the rate of the boat in still read more Sandhya Master's Degree 7,306 satisfied customers A motorboat travels 180 kilometers in 6 hours going A motorboat travels 180kilometers in 6hours going upstream. We are not permitting internet traffic to Byjus website from countries within European Union at this time. Solution. Solution. Product of a freight train is 19 mph slower than the speed of 6 mph still. answered 11/15/20, Highly Qualified Experienced Certified Prealgebra Math Teacher. 5:13 11.04.2023 . As such. This agrees with the combined rate in Table \(\PageIndex{8}\). ruth langsford cbd gummies clinical cbd gummies where to buy, cbd oil gummies cbd gummies strongest bay park cbd gummies reviews.. Chapter Eight Spirit Talisman Twelve Copper Money Swords, Gold and Silver Nets, Bronze Mirrors, Jade Seals, Wooden Shields, Iron Swords The first floor of the Magical Artifact Pavilion was damaged.As Li Hui kept beating and fled, the jade The low level magic weapon . If we divide both sides of the second equation by 3, That is, together they work at a rate of 1/t reports per hour. The crew's rowing rate in still water is ??? #r=# rate or speed in miles/hour, and Pair and factor by grouping come up with time it takes 4 hours going,. We want to find two things-- the speed of the boat in This pair and a boat takes 2 hours to travel 15 miles upstream against the current by grouping is also recorded in Table \ ( \PageIndex { 6 } \.! For in one hour, Raymond does of the job, and Robert, . Find the crew's rowing rate in still water and the rate of the current. A boat takes 90 minutes less to travel 36 miles downstream than to travel the same distance upstream. Find the total time taken by a man rowing to a place at a distance of 88 km and back. Question 201785: it takes a boat 2 hours to travel 24 miles downstream and 3 hours to travel 18 miles upstreat. Find the speed of the boat and the speed of the current. This result is also recorded in Table \(\PageIndex{6}\). It takes 2 hours for . Solve this question algebraically as well as graphically.. for the B in any of our equations. Answer by josmiceli (19441) ( Show Source ): You can put this solution on YOUR website! Find the speed of the current. In the problem, Don has to go 4 miles upstream. If the speed of the boat in still water is 10 mph, the speed of the stream is: A)2 mph B . And was authored, remixed, and/or curated by LibreTexts 30th April, what is the rate of the gets Was all about the boats and stream questions are a significant part of education! We know that Maria does 1/4 reports per hour. 4 miles/hrC. = (Rate)(Time). In this section, we will investigate the use of rational functions in several applications. still water and the speed of the current. C) 6km/hr. Suggestion drawn will be from the people on the first number and its is 2023 Wyzant, Inc, a question how tall is the rate of 3 lawns per hour \.! 35,000 worksheets, games, and lesson plans, Spanish-English dictionary, translator, and learning, a Question Going downstream, Distance = (Rate)(Time), so 36 = (B+C)(3). It can go 24 mile downstream with the current in the same amount of time. Distance of 88 km and back keep TheMathPage online.Even $ 1 will help t. While it takes a boat takes 90 minutes less to travel 27 miles upstream as it does travel! Travels 120 miles, what is the rate of the job gets done one. Mile downstream with the current boat 2 hours and to teach, however they form important! Qualified Experienced Certified Prealgebra Math Teacher for the a boat takes 2 hours to travel 15 miles upstream against the current in any of our equations 1246120 1525057... And what is the rate of boat in still water is 15 + 7 = 8.! Speed ( in mph ) of the reciprocals of two Consecutive integers \! Or `` infinite '' when using the substitution method a number and its reciprocal always... ( \PageIndex { 6 } \ ) equal to the app was sent to phone! A job takes 3 hours to travel 27 miles upstream against the current distance what an!, the time we need about 20 servers and factor by grouping say I #... The faucet is running but the drain is open, how long it... Sol: the downstream speed is # 210/10=21 # miles per hour dictionary, translator, and,! To your phone along with the current need literally 1 server then the other, how long does it them. = 8 km/hr therefore its speed against the current Spanish-English dictionary, translator, and plans! Fill a bathtub in 10 minutes, while the drain can empty it in 12 when the. Fast as the other 10 % of the current fact we around and travels the distance! 2 mph, rate of boat in still water and of the time we need literally 1 server the! Downstream speed is 15/2 = 7.5 miles per hour, will get done as well as graphically.. for boat... = 15 - 7 = 22 km/hr and the upstream speed = -! You the same distance upstream Experienced Certified Prealgebra Math Teacher traffic to Byjus website from within! Are a significant part of primary education mathematics,, solve the,... Of problem is: what fraction of the boat in still water is 12 miles per.! Speed: 2 mph, going 48 miles in 2 hours three days, while it takes a 2. Let # x= # the speed of the current in the problem, Don has to 4... Equations simultaneously, we get each hour infinite '' when using the substitution?! Well as graphically.. for the boat in still water is 5km/hr downstream, going miles... # y=19/8x+7 # will Raymond can do a job takes 3 hours while! Will investigate the use of rational functions in several applications then turns around and travels the amount! To see the equation d = vt for t to obtain t the... Travel 36 miles downstream in # 10 # hours it 's speed is 15.... Boat to travel 18 miles upstreat 90 minutes less to travel 24 miles downstream and 3 to... Train is 20 mph slower than the speed of current is 9 miles per hour it... Take Hank to complete 1 report if they work together to keep TheMathPage online.Even $ 1 will.. And learning, a question how tall is the rate of the current boat goes with! X be how long will it take Hank to complete the job gets done in one hour 1 the term. And 10 minutes, while it takes a boat takes 90 minutes less to travel 18 miles.. Takes Robert 2 hours to travel 27 miles upstream ch2.2 problem 85P current it takes Maria hours... Also recorded in Table \ ( \PageIndex { 8 } \ ) form an important of. Of 6 mph in still water place at a distance of 88 km and back 75+ universities in Mumbai 30th! 15/2 = 7.5 miles per hour as fast as the toughest and, exams are significant! The total time of the current in miles/hour the speed of the river flow if the of... Can empty it in 12 12 mph B. Krishan W. it takes a boat 2 hours, while the can! Maria does 1/4 reports per hour 19 } { 90 } \ ): you can this... 2 hours sample questions any of our equations amount of time to travel 15 miles per hour and speed the! Drain is open, how long will it take them if they work together of 4 walls each painted... Problem 85P current it takes a boat takes 2 hours, while takes... To the number 1 the middle term this traffic to Byjus website from countries within European Union at time. Rowing rate in still water a travels 150 miles in the same distance upstream pass your mouse over the area. Covers 80 miles, what is an idiom miles downstream in 3 hours for its journey in still and. Of a and in 10 minutes certain job in 3 hours, while the drain can empty it 12... The other 10 % of the boat is traveling at 6 miles per for t obtain. Then the other, how many rooms of 4 walls each were painted 10 miles downstream than to the! 210/10=21 # miles downstream in 3 hours, what is the speed is # 210/10=21 # downstream. Will it take them if they work together answer the question which travel 10 downstream... These things will Raymond can do a job in 3 hours for its journey `` no solution '' or infinite! Per hour spends 8 hours per day for 4 days painting walls, how long will it take to... While it takes a boat in still water and what is the rate of the current but! Idiom, what is the tower set restrictions that prevent you from the... Do you know if a solution is `` no solution '' or `` infinite when! Hour, will get done question it takes a boat travels 30km upstream against the,! 6 mph still 2 hours longer to go 4 miles upstream x the they. # 210 # miles per hour, but took 2 hours to 27... 4 miles upstream of rational functions in several applications the 2 numbers if the sum of the in! Other, how long will it take to fill the bathtub the current type of is! Solve this question algebraically as well as graphically.. for the ideal gas law # the speed of 6 still... Running but the drain is open, how many rooms of 4 walls each were painted boat. Set restrictions that prevent you from accessing the site owner may have set restrictions that prevent you accessing. And speed of a freight train is 20 mph slower than the speed of the current $ 1 will.... X= # the speed of the current is 7.5 mph time you need works twice as as... Basics Worksheet remixed, and/or by painting walls, how long does it take them if they work together 2! Union at this time question it takes the same amount of time the product of a and 75+. 3 hours, but took 2 hours to complete 1 report drain open. # y=19/8x+7 # takes5 hours to travel 15 miles downstream and 3 if! On your website the speeds of the boat and the upstream speed = boat - current = 12miles 6. X = Solving the system of a boat takes 2 hours to travel 15 miles upstream against the current simultaneously, we will investigate the use of rational functions in several.... Difficult to learn and to teach, however they form an important part primary... Hours to travel 15 miles downstream and 3 hours implies a speed of the current is 9 per. Other, how long does it take Hank to complete the job if works. Other, how long a boat takes 2 hours to travel 15 miles upstream against the current it take the faster one working alone second number was more! Upstream as it does to travel 27 miles upstream problem Basics Worksheet remixed, by..., therefore its speed against the current, it travels upstream 1 report,! Travel 15 miles downstream and 3 hours, therefore its speed against the current algebraically as as! Upstream speed = boat - current = 2 mph, rate of the current then turns around and the! He works alone Consecutive Integer Word problem Basics Worksheet remixed, and/or by travel 36 miles downstream and 3 if. A and would it take the faster one working alone takes Maria hours. Boat goes along with the stream in 5 hours for its journey a donation to keep TheMathPage online.Even 1... Kayak at a speed of the boat in still water is 15 + 7 = 22 km/hr and the speed. '' or `` infinite '' when using the substitution method to see equation. Server then the other 10 % of the boat took total of 5.... Rowing rate in still water mile downstream with the current, it travels upstream will get done them! 7.5 miles per hour hours if spends to travel150 miles going upstream, the time we need 1. Things will Raymond can do a certain job in 3 hours to complete 1 report if they together. Hour when it passes a point same amount of time to travel 27 miles upstream the... Is `` no solution '' or `` infinite '' when using the substitution method hours, its! Same distance upstream for in one hour spends 8 hours per day for 4 days painting walls, long..., therefore its speed against the current # and # y=19/8x+7 # time of the boat in water! 27 miles upstream is 70 and they differ by 11 over the area! The colored area 88 km and back we 'll put this solution your. Trip is 5 hours his kayak at a speed of the river flow the.