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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This question is part of UPSC Prelims Practice and Mock Tests membership programme.