Determine the time it takes for the motorboat to swim 300 m along the river and return to the starting point.

Determine the time it takes for the motorboat to swim 300 m along the river and return to the starting point. The speed of the boat in still water is 9 m / s, the speed of the current is 6 m / s. What are the boat’s module of movement and the distance traveled?

Decision:
v (downstream) = 9 + 6 = 15 m / s
v (upstream) = 9-6 = 3 m / s
t1 = 300: 15 = 20 s
t2 = 300: 3 = 100 s
t = 120 s = 2 minutes s = 0 m
12 = 600 m
Answer: 2 minutes, 0 meters, 600 meters.