A cistern can be filled by two pipes A and B in 4 hours and 6 hours respectively. When full, the tank can be emptied by a third pipe C in 8 hours . If all the taps be 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 and 6 hours re

1.	A cistern can be filled by two pipes A and B in 4 hours and 6 hours respectively. When full, the tank can be emptied by a third pipe C in 8 hours . If all the taps be turned on at the same time, the cistern will be full in ?
A.	3 hours 18 min.
B.	3 hours 26 min.
C.	3 hours 42 min.
D.	3 hours 48 min.
Answer» C. 3 hours 42 min.

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