A man rows a boat at a speed of 20 km/h in still water. If the current flows at 6 km/h, how long will it take him to travel 60 km downstream?

Explanation

The effective speed while moving downstream is the sum of the boat's speed and the stream's speed: 20 + 6 = 26 km/h. Therefore, the time to cover 60 km downstream is distance divided by speed, which is 60 ÷ 26 = 30/13 hours.