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A man takes twice as long to row a distance against the stream as to row the same distance in favour of the stream. The ratio of the speed of the boat (in still water) and the stream is________?

Correct answer: B. 3 : 1

  • A. 2 : 1
  • B. 3 : 1
  • C. 3 : 2
  • D. 4 : 3

Explanation

For the same distance, taking twice as long upstream means the upstream speed is half the downstream speed. Thus, (v + c) = 2(v - c), where v is still-water speed and c is current speed; solving gives v = 3c. Therefore, the ratio of still-water speed to current speed is 3:1. A common mistake is reversing the ratio and selecting 1:3.

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About Time, Speed and Distance

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