A, B and C are three pipes attached to a cistern. A and B can fill if in 20 minutes and 30 minutes respectively, while C can empty it in 15 minutes. If A, B and C be kept open successively for 1 minute each, how soon will the cistern be filled?

A, B and C are three pipes attached to a cistern. A and B can fill if

1.	A, B and C are three pipes attached to a cistern. A and B can fill if in 20 minutes and 30 minutes respectively, while C can empty it in 15 minutes. If A, B and C be kept open successively for 1 minute each, how soon will the cistern be filled?
A.	180 minutes
B.	60 minutes
C.	157 minutes
D.	155 minutes
Answer» B. 60 minutes

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A, B and C are three pipes attached to a cistern. A and B can fill if in 20 minutes and 30 minutes respectively, while C can empty it in 15 minutes. If A, B and C be kept open successively for 1 minute each, how soon will the cistern be filled?

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