Q: A cistern can be filled by two pipes A and B in 4 hours and 6 hours – McqOptions

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1.	Q: 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.	$$ {2}{2\over 7}{\ hours}$$
B.	$$ {3}{3\over 7}{\ hours}$$
C.	$$ {4}{3\over 7}{\ hours}$$
D.	$$ {2}{5\over 7}{\ hours}$$
Answer» C. $$ {4}{3\over 7}{\ hours}$$

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