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

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.	4.2 hrs
B.	5.7 hrs
C.	6.5 hrs
D.	7.2 hrs
Answer» E.

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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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