Boats & Streams

SSC CGL · Quantitative Aptitude · 12 practice questions with answers and explanations: 3 Easy, 5 Medium, 4 Hard.

Sample questions

Sample Easy question 1

A boat's speed in still water is 15 km/h and the stream flows at 3 km/h. Find its speed downstream.

  1. 45
  2. 15
  3. 18
  4. 12
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Answer: C. Downstream speed = boat + stream = 15 + 3 = 18 km/h.

Sample Medium question 2

A boat covers 24 km downstream in 2 hours and returns the same distance in 3 hours. Find the speed of the stream.

  1. 2
  2. 3
  3. 1
  4. 4
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Answer: A. Downstream = 12 km/h, upstream = 8 km/h. Stream = (12 − 8) ÷ 2 = 2 km/h.

Sample Hard question 3

A boat covers 20 km downstream in 2 hours and the same distance upstream in 5 hours. Find the speed of the boat in still water.

  1. 8
  2. 10
  3. 6
  4. 7
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Answer: D. Downstream = 10 km/h, upstream = 4 km/h. Still water = (10 + 4) ÷ 2 = 7 km/h.

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