Multiple choice general knowledge sports

A man can row 5 kmph in still water. If the river is running at 1kmph, it takes him 75 minutes to row to a place and back. How far is the place?

  1. 3 km

  2. 2.5 km

  3. 4 km

  4. 5 km
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A Correct answer
Explanation

Let the distance be d km. Upstream speed = 5-1 = 4 kmph. Downstream speed = 5+1 = 6 kmph. Total time = d/4 + d/6 = 5d/12 hours. Given time = 75 minutes = 1.25 hours. So 5d/12 = 1.25, giving d = 3 km.

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