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 pipe of diameter d can drain a certain water tank in 40 minutes. T

1.	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
Answer» C. 20 minutes

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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:

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