Your motorboat can move at 30 km/h in still water. What is the minimum time it will take you to move 12 km downstream in a river flowing at 6.0 km/h?

Question

Quizplus · Accepted Answer

The effective speed of the motorboat downstream is the sum of its speed in still water and the speed of the river, which is 30 km/h + 6 km/h = 36 km/h. The time taken to travel 12 km downstream is distance/speed = 12 km / 36 km/h = 1/3 hour = 20 minutes.

Your Motorboat Can Move at 30 Km/h in Still Water