Two pipes M and N can fill a tank in 22.5 and 15 minutes, respectively. If both the pipes are opened simultaneously, after how much time should N be closed so that the tank is full in 18 minutes?

Two pipes M and N can fill a tank in 22.5 and 15 minutes, respectively

1.	Two pipes M and N can fill a tank in 22.5 and 15 minutes, respectively. If both the pipes are opened simultaneously, after how much time should N be closed so that the tank is full in 18 minutes?
A.	4 minutes
B.	3 minutes
C.	4.5 minutes
D.	2.5 minutes
Answer» C. 4.5 minutes

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Two pipes M and N can fill a tank in 22.5 and 15 minutes, respectively. If both the pipes are opened simultaneously, after how much time should N be closed so that the tank is full in 18 minutes?

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