A pipe can fill a cistern in 15 minutes and another pipe can fill it in 12 minutes, and a third pipe can empty it in 6 minutes. If the first two pipes are kept open for 5 minutes in the beginning and then the third pipe is also opened. Find the time taken to empty the cistern?

A pipe can fill a cistern in 15 minutes and another pipe can fill it i

1.	A pipe can fill a cistern in 15 minutes and another pipe can fill it in 12 minutes, and a third pipe can empty it in 6 minutes. If the first two pipes are kept open for 5 minutes in the beginning and then the third pipe is also opened. Find the time taken to empty the cistern?
A.	45 min
B.	48 min
C.	40 min
D.	28 min
E.	None of these
Answer» B. 48 min

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A pipe can fill a cistern in 15 minutes and another pipe can fill it in 12 minutes, and a third pipe can empty it in 6 minutes. If the first two pipes are kept open for 5 minutes in the beginning and then the third pipe is also opened. Find the time taken to empty the cistern?

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