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The speed of a boat in still water is 10...

The speed of a boat in still water is 10 km /hr. If it can travel 26 km downstream and 14 km upstream in the same time, the speed of the stream is : `2\ k m//h r` b. `3\ k m//h r` c. `4\ k m//h r` d. `2. k m//h r`

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