Mathematics · Pipes and Cisterns
Pipes P1 and P2 alone can fill a tank in 5 hours and 10 hours respectively. Pipe P3 alone can empty the same tank in 20 hours. Firstly, both pipes P1 and P2 are opened and after 1 hour pipe P3 is also opened. In how much total time (in hours) will the tank be completely filled?
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