Question

Pipes A and B can fill a tank in 12 hours and 20 hours respectively. The pipe is an emptying pipe. If A, B and C are opened together for 8 hours, 80% of the tank is filled. Initially, pipe B is opened for 4 hours and then it is closed. Pipes A and C together will fill the remaining part of the tank in _________. 

A 12 hours
B 15 hours
C 18 hours
D 16 hours
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