A can do a piece of work in 10 days, B can do it in 12 days and C can do it in 15 days. In how many days will A, B and C finish it, working all together?

A can do a piece of work in 10 days, B can do it in 12 days and C can do it in 15 days. In how many days will A, B and C finish it, working all together?
1). 6 days
2). $5\frac{1}{4}$ days
3). $4\frac{4}{11}$ days
4). 4 days

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