A motorboat can travel at 10 km/h in still water. It travelled 91 km downstream in a river and then returned to the same place, talking altogether 20 h. The rate of flow of river is ?

A motorboat can travel at 10 km/h in still water. It travelled 91 km d

1.	A motorboat can travel at 10 km/h in still water. It travelled 91 km downstream in a river and then returned to the same place, talking altogether 20 h. The rate of flow of river is ?
A.	3 km/h
B.	4 km/h
C.	2 km/h
D.	5 km/h
Answer» B. 4 km/h

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A motorboat can travel at 10 km/h in still water. It travelled 91 km downstream in a river and then returned to the same place, talking altogether 20 h. The rate of flow of river is ?

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