A pipe of diameter d can drain a certain water tank in 40 minutes. The time taken by a pipe of diameter 2d for doing the same job in: - Study24x7
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A pipe of diameter d can drain a certain water tank in 40 minutes. The time taken by a pipe of diameter 2d for doing the same job in:

A

5 minutes

B

10 minutes

C

20 minutes

D

80 minutes

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