Boats & Streams

JKSSB Class-IV & MTS · Mathematics · 12 practice questions with answers and explanations: 3 Easy, 5 Medium, 4 Hard.

Sample questions

Sample Easy question 1

A man rowing upstream against a 5 km/h stream moves at 10 km/h. What is his speed in still water?

  1. 5
  2. 20
  3. 15
  4. 10
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Answer: C. Upstream speed = x − 5 = 10, so x = 15 km/h.

Sample Medium question 2

A boat goes 18 km/h downstream and 12 km/h upstream. Find the speed of the stream.

  1. 6
  2. 2
  3. 15
  4. 3
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Answer: D. Stream = (downstream − upstream) ÷ 2 = (18 − 12) ÷ 2 = 3 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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