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Q.

When a person wants to cross a river in the least possible time he undergoes a drift of 40 m along the flow of the river. If the width of the river is 100 m and the velocity of river flow is 6 m  the velocity of boat in still water is

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a

20 m/s

b

25 m/s

c

15 m/s

d

10 m/s

answer is B.

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Detailed Solution

Question Image

(a) time to cross the river (t)=100VBR

 (b) Drift =VRt

40=6100VBR

⇒VBR=15m/sec

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