A) 3
B) 4
C) \[4\frac{1}{2}\]
D) Insufficient data
Correct Answer: A
Solution :
Man's speed in upstream\[~=4-2=2\text{ }km/h.\] \[\therefore \] Required time \[=\frac{6}{2}=3\]hoursYou need to login to perform this action.
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