If A and B together can complete a piece of work in 20 days, B and C in 10 days and C and A in 12 days, then A, B and C together can complete the same work in :
[A] 4\frac{2}{7}\ days
[B] \frac{7}{60}\ days
[C] 8\frac{4}{7}\ days
[D] 30\ days

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