A cistern can be filled by two pipes A and B in 4 hours and 6 hours respectiA+vely. 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

A cistern can be filled by two pipes A and B in 4 hours and 6 hours

1.	A cistern can be filled by two pipes A and B in 4 hours and 6 hours respectiA+vely. 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
A.	6hrs
B.	4(4/7)hrs
C.	2(1/7)hrs
D.	3(3/7)hrs
Answer» E.

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A cistern can be filled by two pipes A and B in 4 hours and 6 hours respectiA+vely. 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

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