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The speed of a boat in still water is 18...

The speed of a boat in still water is 18 km/h and the speed of the current is 6 km/h. In how much time (in hours) will the boat travel a distance of 90 km up stream and the same distance downstream ?

A

`11(1)/(4)`

B

10

C

`9(1)/(2)`

D

12

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