A can do 1/3rd of a job in 3 days and B can do half of the j

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A can do 1/3rd of a job in 3 days and B can do half of the job in 9 days. If they work on it together, then in how many days can they finish half of the job?

[2017 SSC CGL 17 AUG Shift-2]

A 4

B 5

C 6

D 3