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A man takes 2.2 times as long to row a d...

A man takes 2.2 times as long to row a distance upstream as to row the same distance downstream If he can row 55 km downstream in 2 hours 31 minutes, what is the speed of the boat in still water `40\ k m//h` b. `8\ k m//h` c. `16\ k m//h` d. `24\ k m//h`

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