A, B and C can finish a job working alone in 72, 24 and 36 d

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A, B and C can finish a job working alone in 72, 24 and 36 days respectively. In how many days they can finish the job if they worked together?

[2017 SSC CGL 18 AUG Shift-1]

A 12

B 9

C 15

D 18