A boatman drives his boat 18 km in 2 hours in the direction of the current of the river, and he drives that boat 10km in 2 hours in the opposite direction of the flow, so what is the speed of the flow per hour?

A boatman drives his boat 18 km in 2 hours in the direction of the cur

1.	A boatman drives his boat 18 km in 2 hours in the direction of the current of the river, and he drives that boat 10km in 2 hours in the opposite direction of the flow, so what is the speed of the flow per hour?
A.	2 km/h
B.	4 km/h
C.	8 km/h
D.	3 km/h
Answer» B. 4 km/h

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A boatman drives his boat 18 km in 2 hours in the direction of the current of the river, and he drives that boat 10km in 2 hours in the opposite direction of the flow, so what is the speed of the flow per hour?

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