A and B can do a piece of work in 10 days. B and C can do it in 12 days; C and A in 15 days. In how many days will C finish it alone?

A and B can do a piece of work in 10 days. B and C can do it in 12 days; C and A in 15 days. In how many days will C finish it alone?
1). 24 days
2). 30 days
3). 40 days
4). 60 days

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