"The speed of a boat in still water is 15 km/hr. It can go 30 km upstream and return downstream to
Channel: Doubtnut
Date: 2019-12-27

"The speed of a boat in
 still water is 15 km/hr. It can go 30 km upstream and return downstream to
 the original point in 4 hours 30 minutes. Find the speed of the stream."

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