A tank has two inlet pipe which can fill the tank in 3 hours and 4 hours respectively and has one outlet pipe which can empty the tank in 6 hours. If all the pipes work together then in how many hours the tank will be filled?

A tank has two inlet pipe which can fill the tank in 3 hours and 4 hou

1.	A tank has two inlet pipe which can fill the tank in 3 hours and 4 hours respectively and has one outlet pipe which can empty the tank in 6 hours. If all the pipes work together then in how many hours the tank will be filled?
A.	5/12 hours
B.	11/12 hours
C.	12/5 hours
D.	5/9 hours
E.	7/12 hours
Answer» D. 5/9 hours

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A tank has two inlet pipe which can fill the tank in 3 hours and 4 hours respectively and has one outlet pipe which can empty the tank in 6 hours. If all the pipes work together then in how many hours the tank will be filled?

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