A motorboat can travel at 10 km/h in sti...

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

3 km/hr

4 km/hr

2 km/hr

5 km/hr

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A motor boat can travel at 10 km/hr in still water. It travelled 91 km downstream in a river a then returned taking altogether 20 hours. Find the rate of flow of the river. 3 k m//h r b. 5k m//h r c. 6 k m//h r d. 8 k m//h r

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