Pipe A and B can fill a cistern in 20 minutes and 30 minutes respectiv – McqOptions

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1.	Pipe A and B can fill a cistern in 20 minutes and 30 minutes respectively while C empty cistern in 1 hour. If pipe A and B are opened together with rotten pipe C. If the tank is empty at the beginning then how much time it will take to fills the cistern.
A.	15 minutes
B.	14 minutes
C.	`13 minutes
D.	None of these
Answer» B. 14 minutes

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