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Velocity of boat in still water is 13 m/...

Velocity of boat in still water is 13 m/s. If water flows ina river with a velocity of 5 m/s. What is the difference in times taken by him to cross the river in the shortest path and in the shortest time. If the width of the river is 10 m.

A

1 sec

B

`13/12 sec `

C

`(sqrt3)/(2) sec `

D

None

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