Two pipe can fill a cistern in 3 hours and 4 hours respectively and a waste pipe

Question

Two pipe can fill a cistern in 3 hours and 4 hours respectively and a waste pipe can empty it in 2 hours. If all the three pipes are kept open, then the cistern will be filled in-

Options:

A . 5 hours

B . 8 hours

C . 10 hours

D . 12 hours

Answer: Option D

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