Two pipes M and N can fill a tank in 22 hours and 33 hours respectively. In how much time will the tank be full, if both the pipes are opened simultaneously?

Two pipes M and N can fill a tank in 22 hours and 33 hours respectivel

1.	Two pipes M and N can fill a tank in 22 hours and 33 hours respectively. In how much time will the tank be full, if both the pipes are opened simultaneously?
A.	18 hours
B.	19/22 hours
C.	1(1/11) hours
D.	13(1/5) hours
Answer» E.

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Two pipes M and N can fill a tank in 22 hours and 33 hours respectively. In how much time will the tank be full, if both the pipes are opened simultaneously?

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