There were 3 taps. They were installed to fill up a tank with water. When Tap A and B were turned on at the same time,they took 3 hours to fill up half of the tank. When Tap B and C were turned on at the same time,they took 12 hours to fill up the tank completely. When Tap A and C were turned on at the same time,they took 4 hours to fill up the tank conpletely. How long would it take for the 3 taps to fill up the tank completely with water if they were all turned on at the same time?
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