A and B can do a work in 12 days, B and C in 15 days and C and A in 20 days. If A, B and C work together, they will complete the work in :

A and B can do a work in 12 days, B and C in 15 days and C and A in 20 days. If A, B and C work together, they will complete the work in :
1). 5 days
2). $7\frac{5}{6}$ days
3). 10 days
4). $15\frac{2}{3}$ days

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