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A tank can be filled in 9 hours by one pipe, 12 hours by a second pipe and can be drained when full by a third pipe in 15 hours. How long will it take to fill an empty tank with all pipes in operation?
in Math by engr III (10.4k points) | 24 views

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1/9 + 1/12 + - 1/15 = 1/x

x = 7. 826 hrs
by cadet engr (339 points)

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