A and B can do a piece of work in 24 days. B and C can do a piece of work in 30 days. C and A can do….

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A and B can do a piece of work in 24 days. B and C can do a piece of work in 30 days. C and A can do a piece of work in 40 days. How long would they all take to do the same work together?

Options :-

1. 94 days
2. 31 days
3. 20 days
4. None of these

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