Pipe D1 can fill an empty tank in 80 minutes and Pipe D2 can empty the same tank in 100 minutes. If pipes are opened simultaneously, then in how much time the tank gets completely filled?

Pipe D1 can fill an empty tank in 80 minutes and Pipe D2 can empty the

1.	Pipe D1 can fill an empty tank in 80 minutes and Pipe D2 can empty the same tank in 100 minutes. If pipes are opened simultaneously, then in how much time the tank gets completely filled?
A.	400 minutes
B.	200 minutes
C.	320 minutes
D.	240 minutes
Answer» B. 200 minutes

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Pipe D1 can fill an empty tank in 80 minutes and Pipe D2 can empty the same tank in 100 minutes. If pipes are opened simultaneously, then in how much time the tank gets completely filled?

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