A motor boat can travel at 10 km/h in still water. It travelled 91 km downstream in a river and then returned, taking altogether 20 hours. Find the rate of flow of the river.

A motor boat can travel at 10 km/h in still water. It travelled 91 km

1.	A motor boat can travel at 10 km/h in still water. It travelled 91 km downstream in a river and then returned, taking altogether 20 hours. Find the rate of flow of the river.
A.	6 km/hr
B.	5 km/hr
C.	8 km/hr
D.	3 km/hr
Answer» E.

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A motor boat can travel at 10 km/h in still water. It travelled 91 km downstream in a river and then returned, taking altogether 20 hours. Find the rate of flow of the river.

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