Two pipes P and Q can fill a cistern in 12 min. and 15 min. respectively but a t

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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. P and Q are kept open for 5 min. in the beginning and then ‘R’ is also opened. In what time is the cistern emptied ?

Options:

A . 30 min

B . 35 min

C . 40 min

D . 45 min

Answer: Option D
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