A boat running downstream covers a distance of 20 km in 2 hrs while it covers the same distance upstream in 5 hrs. Then speed of the both in still water is
[A] 10 km/hr
[B] 8 km/hr
[C] 7 km/hr
[D] 9 km/hr

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