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A boat goes 16 km upstream and 24 km dow...

A boat goes 16 km upstream and 24 km downstream in 6 hours. Also it covers 12 km up stream and 36 km downstream in the same time. Find the speed of the boat in still water ?

A

8 km/h

B

4 km/h

C

`2 1/2 km//h`

D

none of these

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