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Q.

A motor boat going down stream comes over a floating body at a point A. 60 minutes later it turned back and after some time passed the floating body at a distance of 12 km from the point A. Find the velocity of the stream assuming constant velocity for the motor boat in still water.

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a

4 km/hr

b

2 km/hr

c

3 km/hr

d

6 km/hr

answer is D.

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Detailed Solution

d=vB+vWt1--(1)

d-12=vB-vwt2--(2)

12=vwt1+t2---(3)

solve above equations

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