A man rows 15 km downstream and 9 km upstream, taking 3 hours each time. What is the speed of the current?
Q1. A man rows 15 km downstream and 9 km upstream, taking 3 hours each time. What is the speed of the current?
Answer: 1 km/h
Explanation: The downstream speed is 15/3 = 5 km/h, and the upstream speed is 9/3 = 3 km/h. The speed of the current is (5 - 3)/2 = 1 km/h.