Mathematics, 25.06.2019 20:00, ramos2019

Atank can be filled by one pump in 50 minutes and by another pump in 60 minutes. a third pump can drain the tank in 75 minutes. if all 3 pumps go into operation, how long will it take to fill the tank? pls

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Atank can be filled by one pump in 50 minutes and by another pump in 60 minutes. a third pump can dr...