Mathematics, 14.12.2020 21:30 coastieltp58aeg

A cistern 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
4x + 5x = 20
15x + 12x - 10x = 60

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A cistern can be completely drained by a pipe in 6 hours. It can be filled by two pipes in 4 hours a...