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A boat takes 8 hours to cover a distance...

A boat takes 8 hours to cover a distance while travelling upstream, whereas while travelling downstream it takes 6 hours. If the speed of the current is 4 kmph, what is the speed of the boat in still water `12\ k m p h` b. `16\ k m p h` c. `28\ k n p h` d. cannot be determined e. none of these

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