Pipe A can fill a tank in 22.5 minutes while a diametrically bigger Pipe B can do it in 15 minutes. Initially we open both the pipes together for some time but after how much time, should we close Pipe B so that the tank is full in 18 minutes?

Pipe A can fill a tank in 22.5 minutes while a diametrically bigger Pi

1.	Pipe A can fill a tank in 22.5 minutes while a diametrically bigger Pipe B can do it in 15 minutes. Initially we open both the pipes together for some time but after how much time, should we close Pipe B so that the tank is full in 18 minutes?
A.	2.5 minutes
B.	3 minutes
C.	4 minutes
D.	4.5 minutes
Answer» C. 4 minutes

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Pipe A can fill a tank in 22.5 minutes while a diametrically bigger Pipe B can do it in 15 minutes. Initially we open both the pipes together for some time but after how much time, should we close Pipe B so that the tank is full in 18 minutes?

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