Boats & Streams

J&K Bank PO · Quantitative Aptitude · 82 practice questions with answers and explanations: 46 Easy, 36 Medium, 0 Hard.

Sample questions

Sample Easy question 1

A boat's speed in still water is 20 km/h and the speed of the stream is 5 km/h. What is its downstream speed (in km/h)?

  1. 30
  2. 100
  3. 25
  4. 15
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Answer: C. Downstream speed = 20 + 5 = 25 km/h.

Sample Easy question 2

A boat's speed in still water is 10 km/h and the speed of the stream is 4 km/h. What is its upstream speed (in km/h)?

  1. 14
  2. 6
  3. 40
  4. 2
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Answer: B. Upstream speed = 10 − 4 = 6 km/h.

Sample Easy question 3

A boat goes downstream at 12 km/h and upstream at 8 km/h. What is its speed in still water (in km/h)?

  1. 2
  2. 10
  3. 11
  4. 4
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Answer: B. Speed in still water = (downstream + upstream)/2 = (12 + 8)/2 = 10 km/h.

Sample Medium question 4

A boat goes downstream at 19 km/h and upstream at 11 km/h. What is the speed of the stream (in km/h)?

  1. 15
  2. 4
  3. 8
  4. 5
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Answer: B. Speed of the stream = (downstream − upstream)/2 = (19 − 11)/2 = 4 km/h.

Sample Medium question 5

A boat with a still-water speed of 15 km/h goes 20 km downstream and comes back to the starting point. If the stream flows at 5 km/h, what is the total time for the round trip (in hours)?

  1. 3
  2. 2
  3. 5
  4. 4
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Answer: A. Time = 20/20 + 20/10 = 3 hours.

Sample Medium question 6

A boat's speed in still water is 18 km/h and the stream flows at 3 km/h. How long will it take to go 42 km downstream (in hours)?

  1. 4
  2. 3
  3. 1
  4. 2
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Answer: D. Downstream speed = 21 km/h; time = 42/21 = 2 hours.

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