Two pipes P and Q can fill a cistern in 12 min. and 15 min. respectively but a third pipe ‘R’ can empty the full tank in 6 min. \xa0P and Q are kept open for 5 min. in the beginning and then ‘R’ is also opened. \xa0In what time is the cistern emptied ?

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D.\xa045 min

Two pipes P and Q can fill a cistern in 12 min. and 15 min. respectively but a third pipe ‘R’ can empty the full tank in 6 min. \xa0P and Q are kept open for 5 min. in the beginning and then ‘R’ is also opened. \xa0In what time is the cistern emptied ?

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