A and B can complete a work in 6 days. B and C can complete the same work in 10 days. A, B and C together can complete the same work in 5 days. In how many days can A and C complete the same work?

A

$$8\frac{1}{2}$$ days

B

8 days

C

7 days

D

$$7\frac{1}{2}$$ days