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?
A)20 min
B)22 min
C)24 min
D)30 min

Question

Quizplus · Accepted Answer

The 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. To find the time, divide the distance by the speed: 12 km / 36 km/h = 1/3 hour = 20 minutes.

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