One of the two inlet pipes works twice as efficiently as the other. The two can fill the empty cistern in 12 hours. A drain pipe can empty a cistern all by itself in 12 hours. How many hours will the more efficient inlet pipe take to fill the empty cistern by itself?

One of the two inlet pipes works twice as efficiently as the other. Th

1.	One of the two inlet pipes works twice as efficiently as the other. The two can fill the empty cistern in 12 hours. A drain pipe can empty a cistern all by itself in 12 hours. How many hours will the more efficient inlet pipe take to fill the empty cistern by itself?
A.	9
B.	15
C.	12
D.	18
Answer» E.

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One of the two inlet pipes works twice as efficiently as the other. The two can fill the empty cistern in 12 hours. A drain pipe can empty a cistern all by itself in 12 hours. How many hours will the more efficient inlet pipe take to fill the empty cistern by itself?

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