A, B and C can complete a piece of work individually in $$7\frac{1}{2}$$ days, 15 days and 30 days, respectively. A and B start
working but A quits the job after 3 days. Then C joined B and both did the work till the completion of the work. In how many days will the whole work be completed?

A

12 days

B

7 days

C

8 days

D

6 days