Mathematics · Time and Work
Pipes A and B can fill a tank in 12 hours and 20 hours, respectively. Pipe C is an emptying pipe. If A, B, and C are opened together for 8 hours, then 80% of the tank is filled. Initially, pipe B is opened for 4 hours and then closed. Pipes A and C together will fill the remaining part of the tank in how many hours?
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