A man rows his boat 120 km downstream and 60 km upstream, taking 2 hours each time. Find the speed of the stream?\nOptions:\n(A) 6\n(B) 15\n(C) 17\n(D) 18\n(E) 2 Stream of consciousness first, then make a decision:
User
Speed downstream = d/t = 120/(2 ) = 60 kmph\nSpeed upstream = d/t = 60/(2) = 30 kmph\nThe speed of the stream = (60 - 30)/2 = 15 kmph
Thus, the answer is (B).
Assistant