Two inlet pipes P and Q can fill a water tank in 20 minutes and 30 minutes respectively. Another outlet pipe R can empty the water tank in 40 minutes. If all the three pipes were opened together but Pipe R was closed 5 minutes before the tank was filled. In how many minutes the tank was filled?

Two inlet pipes P and Q can fill a water tank in 20 minutes and 30 min

1.	Two inlet pipes P and Q can fill a water tank in 20 minutes and 30 minutes respectively. Another outlet pipe R can empty the water tank in 40 minutes. If all the three pipes were opened together but Pipe R was closed 5 minutes before the tank was filled. In how many minutes the tank was filled?
A.	19 2 minutes 7
B.	10 5 minutes 13
C.	15 minutes
D.	20 minutes
E.	None of these
Answer» D. 20 minutes

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Two inlet pipes P and Q can fill a water tank in 20 minutes and 30 minutes respectively. Another outlet pipe R can empty the water tank in 40 minutes. If all the three pipes were opened together but Pipe R was closed 5 minutes before the tank was filled. In how many minutes the tank was filled?

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