Two pipes P and Q can fill a tank in 40 minutes and 30 minutes respect – McqOptions

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1.	Two pipes P and Q can fill a tank in 40 minutes and 30 minutes respectively. Both pipes are opened simultaneously and after 10 minutes pipe Q is closed. In what time after this will the tank get filled up?
A.	16 minutes 40 seconds
B.	16 minutes
C.	15 minutes
D.	15 minutes 20 seconds
Answer» B. 16 minutes

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