Two pipes A and B can fill a cistern in 9 minutes and 6 minutes respec – McqOptions

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1.	Two pipes A and B can fill a cistern in 9 minutes and 6 minutes respectively. Both the pipes are turned on simultaneously. When should the second pipe be closed, if the cistern is to be filled in 4 minutes?
A.	13/6 min
B.	10/3 min
C.	15/4 min
D.	7/2 min
Answer» C. 15/4 min

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