Multiple choice

If A can row 15km downstream in 12 minutes and his rowing speed in still water is 56kmph, then how much distance can he cover upstream in 20 minutes?

  1. 9km

  2. 24km

  3. 10km

  4. None of these
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Downstream distance = 15km in 12 minutes = 75kmph. Downstream speed = rowing speed + current, so current = 75 - 56 = 19kmph. Upstream speed = 56 - 19 = 37kmph. In 20 minutes (1/3 hour), upstream distance = 37 × (1/3) = 12.33km, which is not among options A-C. Hence D is correct.

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