Taps A and B can fill a tank in 6 hours and 9 hours respectively and tap C can fill it in 12 hours. If all of the taps are opened together. What amount of time is required to fill it,

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Taps A and B can fill a tank in 6 hours and 9 hours respectively and tap C can fill it in 12 hours. If all of the taps are opened together. What amount of time is required to fill it,