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A boat which has a speed of `5 km// hr ` in steel water crosses a river of width ` 1 km` along the shortest possible path in `15 minutes`. The velocity of the river water in ` km// hr` isA. 1B. 3C. 4D. `sqrt(41)` |
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Answer» Correct Answer - B `v_(B//W)sintheta=V_(W)` `(1)/(4)=(1)/(V_(B//W)costheta)` `V_(B//W)costheta=4` `costheta=(4)/(5)` `theta=37^(@)` `5 sin37^(@)=V_(W)` `V_(W)=3km//hr` |
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