A and B together take 6 days to complete a task. B and C together take 12 days to complete the same task. A and C together take 8 days to complete it. If A, B and C are working together, how long does it take for them to complete the task?
A. 4(2/3) days
B. 1(1/3) days
C. 4 days
D. 5(1/3) days
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