Mathematics, 30.07.2019 08:20 ReaLily

Acistern can be completely drained by a pipe in 6 hours. it can be filled by two pipes in 4 hours and 5 hours, respectively. how many hours will the empty cistern take to fill if all the pipes are running? if x is the time to fill it, which of the following equations could be used to solve for t? 4x + 5x - 6x = 1 15x + 12x - 10x = 60 4x + 5x = 20

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