A can do $$\frac{2}{5}$$ of a work in 6 days and B can do 30% of the same work in 3 days. They worked together for 4 days. The remaining work was comple1ed by C alone in 6 days. B and C together can complete 70% of the original work in:

A

$$5\frac{1}{2}$$

B

4

C

5

D

$$4\frac{1}{2}$$