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A swimmer can swim at 3 sqrt(2) km*h^(-1...

A swimmer can swim at `3 sqrt(2) km*h^(-1)` in still water. He swims across a river when the velocity of current is `3 km *h^(-1)`.
(ii) In what direction should he swim to cross the river in minimum time ? In that case how far will he be carried by the river current if the river is `sqrt(2)` km wide ?

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The correct Answer is:
`90^@` to the direction of current of current ,1 km
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