A man can row a boat at 10 kmph in still water and the speed of the stream is 8 kmph. What is then time taken to row a distance of 90 km down the stream ?\nOptions:\n(A) 8hrs\n(B) 5 hrs\n(C) 15 hrs\n(D) 15 hrs\n(E) 20 hrs OK. Let's think. Some random thoughts first:
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Speed in down stream = 10 +8 = 18\nTime taken to cover 90 km down stream = 90/18 = 5 hrs. The answer: (B).
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