Question

Three pipes are connected to a cistern such that pipes A and B can fill the cistern in 12 minutes and 18 minutes respectively, and pipe C can empty the cistern in 24 minutes. If all the pipes are opened together and pipe B is closed after a certain time, the total time taken to fill the cistern is 15 minutes. Find after how many minutes pipe B should be closed.

A 12 mins 45 Secs
B 6 mins 75 secs
C 10 mins 25 secs
D 18 mins 20 secs
E None of these
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