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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

12

B

`11(1)/(4)`

C

10

D

`9(1)/(2)`

Text Solution

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The correct Answer is:
B
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