A pipe can fill a cistern in 12 hours and another pipe can empty it completely in 18 hours, If both the pipes are opened together, then the cistern will be filled in :

A pipe can fill a cistern in 12 hours and another pipe can empty it co

1.	A pipe can fill a cistern in 12 hours and another pipe can empty it completely in 18 hours, If both the pipes are opened together, then the cistern will be filled in :
A.	30 hours
B.	36 hours
C.	40 hours
D.	44 hours
Answer» C. 40 hours

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A pipe can fill a cistern in 12 hours and another pipe can empty it completely in 18 hours, If both the pipes are opened together, then the cistern will be filled in :

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