A and B together can do a work in 8 days, B and C together in 6 days, while C and A together in 10 days, if they all work together, then the work will be completed in :
[A] $4\tfrac{4}{9}days$
[B] $3\tfrac{3}{4}days$
[C] $5\tfrac{5}{47}days$
[D] $3\tfrac{3}{7}days$
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