A, B and C can do a job working alone in 12, 16 and 24 days respectively. In how many days they can do the job if they worked together?

A, B and C can do a job working alone in 12, 16 and 24 days respectively. In how many days they can do the job if they worked together?
1). $\frac{16}{3}$
2). $\frac{15}{4}$
3). $\frac{17}{3}$
4). $\frac{19}{4}$

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