Mathematics · Pipes and Cisterns
Pipes A and B can fill a tank in 9 hours and 15 hours respectively, and pipe C can empty the tank in 25 hours. If pipes A, B, and C are opened simultaneously, pipe A is closed after 4 hours, pipe B is closed 1 hour before pipe A is closed, and pipe C is closed after 10 hours, then what part of the tank is filled?
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