A man rows his boat 90 km downstream and 5` km upstream, taking 3 hours each time. Find the speed of the stream?\nOptions:\n(A) 7 kmph\n(B) 5 kmph\n(C) 2 kmph\n(D) 8 kmph\n(E) 1 kmph Stream of consciousness:
User
Speed downstream = d/t = 90/(3) = 30 kmph\nSpeed upstream = d/t = 51/(3) = 17 kmph\nThe speed of the stream = (30 - 17)/2 = 7 kmph
Thus, the answer is (A).
Assistant