A water tank can be emptied in 40 minutes by a pipe of d 'diameter, so how long will it take for a 2d diameter pipe to be emptied?

A water tank can be emptied in 40 minutes by a pipe of d 'diameter, so

1.	A water tank can be emptied in 40 minutes by a pipe of d 'diameter, so how long will it take for a 2d diameter pipe to be emptied?
A.	20 min
B.	10 min
C.	40 min
D.	80 min
Answer» C. 40 min

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A water tank can be emptied in 40 minutes by a pipe of d 'diameter, so how long will it take for a 2d diameter pipe to be emptied?

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