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Q.

A man swimming downstream overcomes a float at a point M. After travelling distance D, he turned back and passed the float at a distance of D/2 from the point M. Then the ratio of speed of swimmer with respect to still water to the speed of the river will be 

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a

2

b

1

c

3

d

4

answer is D.

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Detailed Solution

 Time taken for swimmer for (AC + CB) = Time taken to float for AB 

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⇒Dv+u+D/2v−u=d/2u⇒vu=3

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