A can do 75% of a job in 9 days and B can do half of the job in 8 days. If they work on it together, then in how many days can they do half of the job?

A can do 75% of a job in 9 days and B can do half of the job in 8 days. If they work on it together, then in how many days can they do half of the job?
1). $\frac{40}{7}$
2). $\frac{24}{7}$
3). $\frac{7}{2}$
4). $\frac{9}{2}$

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