A can do a certain work in 12 days. B is 60% more efficient than A. How many days will B and A together take to do the same job ?

A can do a certain work in 12 days. B is 60% more efficient than A. How many days will B and A together take to do the same job ?
1). $\frac{80}{13}$ days
2). $\frac{70}{13}$ days
3). $\frac{75}{13}$ days
4). $\frac{60}{13}$ days

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