A water tank can be emptied by a pipe of diameter d in 40 minutes. The – McqOptions

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1.	A water tank can be emptied by a pipe of diameter d in 40 minutes. Then how much time will it take for a pipe of diameter 2d to empty it?
A.	10 minutes
B.	23 minutes
C.	11 minutes
D.	56 minutes
Answer» B. 23 minutes

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