Pipe P1 and P2 can fill the same tank in 60 minutes and 30 minutes, respectively. Another pipe P3, can empty the same tank in 45 minutes. How much time (in minutes) is required to fill the tank if all three pipes are opened together?

Pipe P1 and P2 can fill the same tank in 60 minutes and 30 minutes, re

1.	Pipe P1 and P2 can fill the same tank in 60 minutes and 30 minutes, respectively. Another pipe P3, can empty the same tank in 45 minutes. How much time (in minutes) is required to fill the tank if all three pipes are opened together?
A.	15 min
B.	21 min
C.	28 min
D.	36 min
E.	45 min
Answer» E. 45 min

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Pipe P1 and P2 can fill the same tank in 60 minutes and 30 minutes, respectively. Another pipe P3, can empty the same tank in 45 minutes. How much time (in minutes) is required to fill the tank if all three pipes are opened together?

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