A man can swim at 3 km/hr in a static river. If he wants to cross a river of width 500 m in shortest possible time, then at what angle with repect to direction of motion he should move?

  • Option 1)

    0\degree

  • Option 2)

    45 \degree

  • Option 3)

    60\degree

  • Option 4)

    90\degree

 

Answers (1)
P Prateek Shrivastava

As we have learnt

 

Boat - River Problem -

To cross the river in the shortest time.

- wherein

Drift along river flow x= d\left ( \frac{u}{v} \right )

 

 

If he wants to cross the river in shortest possible time, then he must move along a direction per pendicular to direction of river flow.


Option 1)

0\degree

Option 2)

45 \degree

Option 3)

60\degree

Option 4)

90\degree

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