A pipe can fill a tank in 6 hours. Another pipe can empty the tank in 12 hours. If both pipes are opened simultaneously, the part of tank filled by both pipes in 1 hour is?

A pipe can fill a tank in 6 hours. Another pipe can empty the tank in

1.	A pipe can fill a tank in 6 hours. Another pipe can empty the tank in 12 hours. If both pipes are opened simultaneously, the part of tank filled by both pipes in 1 hour is?
A.	1/9 th part
B.	1/6 th part
C.	1/12 th part
D.	1/3 rd part
Answer» D. 1/3 rd part

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A pipe can fill a tank in 6 hours. Another pipe can empty the tank in 12 hours. If both pipes are opened simultaneously, the part of tank filled by both pipes in 1 hour is?

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