A cistern can be completely drained by a pipe It 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
O 4x + 5x = 20
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