Mathematics · Time and Work
Pipes A and B can fill a tank in 18 hours and 45 2 hours, respectively. Pipe C is an emptying pipe. When all three pipes are opened together for 3 hours, then 20% of the tank is filled. A and B are opened together for 4 hours, then A is closed and C is opened instantly with B. In how much total time (in hours) will the whole tank be filled?
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