Mathematics, 15.12.2019 04:31 130004979
Atank can be filled by one pipe in four hours and by a second pipe in six hours; and when it is full, the tank can be drained by a third pipe in three hours. if the tank is empty and all three pipes are open, in how many hours will the tank be filled?
a. 8 hours
b. 12 hours
c. 24 hours
Answers: 2
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