Two fill pipes A and B can fill a cistern in 12 and 16 minutes respectively. Both fill pipes are opened together, but 4 minutes before the cistern is full, one pipe A is closed. How much time will the cistern take to fill?

Two fill pipes A and B can fill a cistern in 12 and 16 minutes respect

1.	Two fill pipes A and B can fill a cistern in 12 and 16 minutes respectively. Both fill pipes are opened together, but 4 minutes before the cistern is full, one pipe A is closed. How much time will the cistern take to fill?
A.	\[9\frac{1}{7}\] minutes
B.	\[3\frac{1}{3}\] minutes
C.	5 minutes
D.	\[3\,\] minutes
E.	None of these
Answer» B. \[3\frac{1}{3}\] minutes

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Two fill pipes A and B can fill a cistern in 12 and 16 minutes respectively. Both fill pipes are opened together, but 4 minutes before the cistern is full, one pipe A is closed. How much time will the cistern take to fill?

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