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A motor boat can travel at 10 km/hr in s...

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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