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A man can row a boat with 4 kmph in stil...

A man can row a boat with 4 kmph in still water. If he is crossing a river where the current is 8 kmph. In what time he will cross the river in the shortest path ? ( Width of river is 8 km)

A

`(2)/(sqrt(3))` hr

B

`(4)/(sqrt(3))` hr

C

1 hr

D

`4/3` hr

Text Solution

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The correct Answer is:
B
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Knowledge Check

  • A river flows at the rate of 3 km/hr and a person can row a boat at a speed of 5 km/hr is still water. If the difference between the times taken to cross the river by the shortest path the quickest time be 4 minutes, find the width of the rivers.

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    `1 1/3` km
    C
    `3 1/4` km
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    `4 1/3` km

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    1s
    B
    10s
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    `(sqrt(3))/(2)`
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  • The velocity of a boat in still water is 10 m/s. If water flows in the river with a velocity of 6 m/s what is the difference in times taken to cross the river in the shortest path and the shortest time. The width of the river is 80 m

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    D
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