Q: A man rows his boat 80 km downstream and 38 km upstream, taking 3 hours each time. Find the speed of the stream?
Options:
(A) 6
(B) 9
(C) 7
(D) 8
(E) 2 Let's give some random thoughts before answering.
Speed downstream = d/t = 80/(3) = 27 kmph
Speed upstream = d/t = 38/(3) = 9 kmph
The speed of the stream = (27 - 9)/2 = 9 kmph
Therefore, the answer is (B).