A Cistern can be filled by a tap in 4 hours while it can be emptied by another tap in 9 hours. If both the taps are opened simultaneously then after how much time will the cistern get filled?

A Cistern can be filled by a tap in 4 hours while it can be emptied by

1.	A Cistern can be filled by a tap in 4 hours while it can be emptied by another tap in 9 hours. If both the taps are opened simultaneously then after how much time will the cistern get filled?
A.	6.5 hrs
B.	7.2 hrs
C.	2.5 hrs
D.	3 hrs
Answer» C. 2.5 hrs

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A Cistern can be filled by a tap in 4 hours while it can be emptied by another tap in 9 hours. If both the taps are opened simultaneously then after how much time will the cistern get filled?

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