A cadet rows 10 km downstream in 2 hours and the same distance upstream in 5 hours. What is his speed in still water?
Q1. A cadet rows 10 km downstream in 2 hours and the same distance upstream in 5 hours. What is his speed in still water?
Answer: 3.5 km/h
Explanation: Downstream speed is 5 km/h and upstream speed is 2 km/h. Still-water speed is the average, (5 plus 2) divided by 2, which is 3.5 km/h.