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.
4.5hrs
B.
5hrs
C.
6.5hrs
D.
7.2hrs
Correct Answer : D

Question

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 to Z Exams · Accepted Answer

7.2hrs

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