A man rows his boat 85 km downstream and 45 km upstream, taking 2 1/2 hours each time. Find the speed of the stream?
Q1. A man rows his boat 85 km downstream and 45 km upstream, taking 2 1/2 hours each time. Find the speed of the stream?
Answer: 8 kmph
Explanation: Downstream speed = 85 ÷ 2.5 = 34 km/h; upstream = 45 ÷ 2.5 = 18 km/h; stream speed = (34 − 18) ÷ 2 = 8 km/h.