A cistern can be filled by two pipes A and B in 4 hours. When full, the tank can be emptied by a third pipe C in 8 hours. If all taps are turned on at the same time, the cistern will be full in?

A cistern can be filled by two pipes A and B in 4 hours. When full, th

1.	A cistern can be filled by two pipes A and B in 4 hours. When full, the tank can be emptied by a third pipe C in 8 hours. If all taps are turned on at the same time, the cistern will be full in?
A.	4 hours
B.	8 hours
C.	16 hours
D.	8/3 hours
Answer» C. 16 hours

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A cistern can be filled by two pipes A and B in 4 hours. When full, the tank can be emptied by a third pipe C in 8 hours. If all taps are turned on at the same time, the cistern will be full in?

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