Two pipes A arid B can separately fill a cistern in 60 minutes and 75 minutes respectively. There is a third pipe in the bottom of the cistern to empty it. If all the three pipes are simultaneously op

Two pipes A arid B can separately fill a cistern in 60 minutes and

1.	Two pipes A arid B can separately fill a cistern in 60 minutes and 75 minutes respectively. There is a third pipe in the bottom of the cistern to empty it. If all the three pipes are simultaneously op
A.	90 min
B.	100 min
C.	110 min
D.	120 min
Answer» C. 110 min

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Two pipes A arid B can separately fill a cistern in 60 minutes and 75 minutes respectively. There is a third pipe in the bottom of the cistern to empty it. If all the three pipes are simultaneously op

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