Multiple choice

A man can row a certain distance downstream in 12 hour and return the same distance in 18 hour. If the speed of a man in still water is 12 kmph, Find the speed of the stream.

  1. 2.1 kmph

  2. 1.5 kmph

  3. 4.4 kmph

  4. 2.4 kmph

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

Let stream speed = s kmph. Downstream speed = (12 + s), upstream speed = (12 - s). Distance is same. Time downstream = 12 hours, upstream = 18 hours. Distance = (12 + s) × 12 = (12 - s) × 18. 144 + 12s = 216 - 18s. 30s = 72. s = 72/30 = 2.4 kmph.

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