1.

 A cistern can be filled by two pipes. A and B in 12 minutes and 14 minutes respectively and can be emptied by a third pipe C in 8 minutes. If all the taps be turned on at the same moment, what part of

A. 5/24
B. 19/24
C. 7/24
D. 17/24
Answer» C. 7/24


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