A cistern is filled by tap A in 4 hours where as it can be emptied by tap B in 9 hours. If both the taps are opened simultaneously, in how much time will the cistern be filled ?

A cistern is filled by tap A in 4 hours where as it can be emptied by

1.	A cistern is filled by tap A in 4 hours where as it can be emptied by tap B in 9 hours. If both the taps are opened simultaneously, in how much time will the cistern be filled ?
A.	7 hours
B.	7.1 hours
C.	7.2 hours
D.	7.3 hours
Answer» D. 7.3 hours

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A cistern is filled by tap A in 4 hours where as it can be emptied by tap B in 9 hours. If both the taps are opened simultaneously, in how much time will the cistern be filled ?

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