A and B can do a piece of work in 4 days. B and C can do the same work in 5 days, A and C can do it in 10 days. If A, B, C work together, in how many days can they complete the work?

1. A.11 7/3
2. B.3 7/11✓ Correct
3. C.3 11/7
4. D.11 3/7

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