A can do a piece of work alone in 30 days. B is 25% less efficient than A. While C is 33⅓% more efficient than B. In how many days can A, B and C, working together, complete the work?

1. A.140/11 days
2. B.120/11 days✓ Correct
3. C.130/11 days
4. D.150/11 days

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