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Mathematics, 23.01.2020 13:31 shahfaisal
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?
8 hours
12 hours
24 hours
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Atank can be filled by one pipe in four hours and by a second pipe in six hours; and when it is ful...
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