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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

A

6 km/hr

B

5 km/hr

C

8 km/hr

D

3 km/hr

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The correct Answer is:
D
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