A man rows his boat 70 km downstream and 45 km upstream, taking 2 1/2 hours each time. Find the speed of the stream?\nOptions:\n(A) 1 kmph\n(B) 6 kmph\n(C) 5 kmph\n(D) 8 kmph\n(E) 7 kmph Think first, then make a decision. Some random thoughts:
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Speed downstream = d/t = 75/(2 1/2) = 28 kmph\nSpeed upstream = d/t = 45/(2 1/2) = 18 kmph\nThe speed of the stream = (28 - 18)/2 = 5 kmph So the answer is (C).
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