If A, B and C can do a job working alone in 12, 18 and 36 da

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If A, B and C can do a job working alone in 12, 18 and 36 days respectively. They all work together for 2 day, then B quits. How many days will A and C take to finish rest of the job?

[SSC CGL Tier-2 19-February-2018 Maths]

A 9

B 6

C 3

D 4