A man can swim at the rate of 4 km/hr in still water. If the speed of the water is 2 km/hr, then the time taken by him to swim 10 km upstream is :
[A] $2\frac{1}{2} hrs$
[B] $3\frac{1}{2} hrs$
[C] $4 hrs$
[D] $5 hrs$

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