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  • How to solve this problem- A man can swim with a speed of 4km/hr in still water. He crosses a river 1 km wide that flows steadily at 3 kmph. If he makes his stroke normal to the river current, how far down the river does he go when he reaches the oth

A man can swim with a speed of 4km/hr in still water. He crosses a river 1 km wide that flows steadily at 3 kmph. If he makes his stroke normal to the river current, how far down the river does he go when he reaches the other bank ?

  • Option 1)

    500 m

  • Option 2)

    600 m

  • Option 3)

    750 m

  • Option 4)

    850 m

 

Answers (1)

best_answer

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 )

 

 

drift  = \left(\frac{d}{v} \right )\cdot u \\* = 1km\times \frac{3}{4} = 750 m


Option 1)

500 m

Option 2)

600 m

Option 3)

750 m

Option 4)

850 m

Posted by

Plabita

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