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Q.

A man's speed with the current is Question Image. and the speed of the current is Question Image. The mans speed against the current is:


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a

Question Image

b

Question Image

c

Question Image

d

Question Image 

answer is C.

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Detailed Solution

Concept- Consider that a man is moving at u km/hr while a stream is moving at v km/hr. Use the equation u+v=15 km/hr to calculate the speed of a man in still water from the relative speed given. Then, using the u-v relation, determine the speed of a guy moving against a current.
Man's rate in still water Question Image.
Man's rate against the current Question ImageHence, the correct option is 3.
 
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