Boats and Streams Questions and Answers

Boats and Streams Questions 

The subject matter of Boats and Streams Questions is quite essential as these questions are there in nearly all competitive exams from the topic. It is also included in Aptitude section of many job test in companies like TCS, Infosys etc.The idea is not that hard to fathom rather it is somewhat connected to the area of Speed, Distance and Time. When a boat is supposed to go downstream if it moves along with the course of the stream. The boat’s net speed in this scenario is known as the downstream speed. When a boat is assumed to go upstream if it moves along in the way opposite to the course of the stream. The boat’s net speed in this scenario is known as the upstream speed.Speed of the boat is given by half of sum of upstream and down stream speed and speed of the stream by half of difference between downstream and upstream speed.Speed Downstream is equal to sum of the speed of boat and speed of stream. Speed Upstream is equal to  speed of the stream subtracted by speed of the boat.

Boats and Streams Questions

Rules:

  • When the speed of the boat or swimmer is ‘x’ km per hour and the stream’s speed is ‘y’ km per hour, then:
    • The speed of the swimmer or boat upstream = (x – y) km per hour
    • The speed of the swimmer or boat downstream = (x + y) km per hour
  • In the stationary or still water
    • The speed of the boat is given by = 1/2 (downstream speed + upstream speed)
    • The speed of the stream is provided by = 1/2 (downstream speed – upstream speed)
  • A certain distance in p1 hours is covered by a man when he rows downstream and comes back the equal distance upstream in p2 hours. If the stream’s speed is assumed as s km/hr, then the man’s speed in still water will be: s ( p2+ p1)/ ( p2-p1) km/hr

Question 1

Time: 00:00:00
Alex can row a boat at 7 kmph downstream and 3 kmph upstream. Calculate her rowing speed in still water and the rate of the current?

5 Kmph and 2 kmph

5 Kmph and 2 kmph

7.5 kmph and 3 Kmph

7.5 kmph and 3 Kmph

6.4 kmph and 14 kmph

6.4 kmph and 14 kmph

None of the above

None of the above

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Question 2

Time: 00:00:00
Sam’s Rowing speed is 10 kmph, but he takes double time in rowing the boat upstream in comparison to downstream. Calculate the rate of the stream?

2.18 kmph

2.18 kmph

3.33 kmph

3.33 kmph

1.56 kmph

1.56 kmph

4.36 kmph

4.36 kmph

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Question 3

Time: 00:00:00
What will be the speed of the boat if the river flows at a speed of 2 km/hr, and it takes 12 minutes to cover 4 km upstream?

21

21

16

16

22

22

30

30

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Question 4

Time: 00:00:00
Calculate the speed of a motorboat in still water if current of the river flows at 2 kmph, and the boat takes 40 mins. To cover 10 km upstream and back again at the starting point.

19

19

30.13

30.13

26

26

None

None

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Question 5

Time: 00:00:00
Sam rows a boat at a speed of 6 kmph in still water. If the speed of the stream 2 kmph, in how much time will Sam take to cover 36 km downstream?

7

7

4.5

4.5

6.2

6.2

3

3

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Question 6

Time: 00:00:00
Tom takes 2 hours to sail a boat for 4 km against the stream and can cover 2 km distance in 20 minutes if he rows the boat along with the current of the river. Calculate the time taken to cover 10 km in stagnant water?

2.5

2.5

3.3

3.3

4.7

4.7

None

None

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Question 7

Time: 00:00:00
Sam takes 12.5 minutes to cover 900 meters distance rowing the boat against the stream of the river and takes 7.5 minutes to row the same boat downstream. Calculate Sam’s speed of rowing the boat in still water?

5.76 kmph

5.76 kmph

4.75 kmph

4.75 kmph

2.65 kmph

2.65 kmph

3.22 kmph

3.22 kmph

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Question 8

Time: 00:00:00
The speed of a boat in still water is 4.5 kmph, and the rate of the river flow is 3 kmph. Calculate the total time taken by Agatha to cover a distance of 7.5 km to and fro in the same river?

6 hrs

6 hrs

5 hrs

5 hrs

4 hrs

4 hrs

5.5 hrs

5.5 hrs

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Question 9

Time: 00:00:00
Sam takes triple time to row a boat against the stream of the river than the time he takes to row with the stream to cover the same distance. What will be the ratio between the speed of the boat in still water to that of the flow?

3:2

3:2

2: 1

2: 1

3:1

3:1

4:3

4:3

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Question 10

Time: 00:00:00
Tom rows for 7 hours to cover a distance of 24 km of the lake. Later he analyses that he takes the same time to cover 8 km distance with the stream and 6 km distance against the stream. Calculate the rate of the stream?

2/7

2/7

1

1

5/7

5/7

4

4

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Question 11

Time: 00:00:00
A boat takes 20 hours to travel downstream from point P to Point Q. and coming back to a point R midway between P and Q. If the velocity of the stream is 5 kmph, and speed of the boat in still water is 13 kmph, then what is the distance between P and Q?

150.3 kmph

150.3 kmph

200 kmph

200 kmph

180 kmph

180 kmph

122.4 kmph

122.4 kmph

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Question 12

Time: 00:00:00
Joe takes 4 hours to row a boat downstream to cover a distance of 32 km, whereas it takes him 8 hours to cover the same distance upstream. What will be the speed of the boat in stagnant water?

6 kmph

6 kmph

8 kmph

8 kmph

7 kmph

7 kmph

9 kmph

9 kmph

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Question 13

Time: 00:00:00
Calculate the distance covered by a boat downstream in 24 minutes if the speed of the boat in still water is 30 kmph and the speed of the current is 6 kmph?

12.3 km

12.3 km

10 km

10 km

14.4 km

14.4 km

None

None