Nirmit can do $\frac{2}{3}$ of a job in 18 days. Kashish is twice as efficient as Nirmit. In how many days Kashish will complete the job?

Nirmit can do $\frac{2}{3}$ of a job in 18 days. Kashish is twice as efficient as Nirmit. In how many days Kashish will complete the job?
1). $\frac{29}{4}$
2). $\frac{27}{2}$
3). $\frac{31}{2}$
4). $\frac{13}{2}$

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