A man rows his boat 78 km downstream and 56 km upstream, taking 4 hours each time. Find the speed of the stream?\nOptions:\n(A) 6\n(B) 5\n(C) 7\n(D) 8\n(E) 3 Stream of consciousness:
User
Speed downstream = d/t = 78/(4) = 20 kmph\nSpeed upstream = d/t = 56/(4) = 14 kmph\nThe speed of the stream = (20 - 14)/2 = 3 kmph
Thus, the answer is (E).
Assistant