A boatman finds that he can save 6 s in ...

A boatman finds that he can save `6 s` in crossing a river by the quickest path than by the shortest path. If the velocity of the boat and the river be, respectively, `17 ms^-1 and 8 ms^-1`, find the river width.

675m

765m

567m

657m

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The correct Answer is:

`R=(u^(2)sin 2 theta)/(g)`

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