Mathematics, 20.01.2020 08:31, plutoaliko99

Atank can be filled by one pump in 3.2 hours and by another pump in 80 minutes. a third pump can drain the tank in 2 hours and 20 minutes. if all 3 pumps go into operation, how long will it take to fill the tank?

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Atank can be filled by one pump in 3.2 hours and by another pump in 80 minutes. a third pump can dra...