Prabhat has done$\frac{1}{2}$ of a job in 12 days. Santosh completes the rest of the job in 6 days. In how many days can they together do the job?

Prabhat has done$\frac{1}{2}$ of a job in 12 days. Santosh completes the rest of the job in 6 days. In how many days can they together do the job?
1). 12 days
2). 4 days
3). 8 days
4). 16 days

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