'K' can do $$3/4^{th}$$ of a work in 6 days and J can do $$2/5^{th}$$ of the same work in 4 days. How long (in days) will they take, if they work together to finish the work?

A

$$4\frac{2}{3}$$

B

$$4\frac{3}{8}$$

C

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

D

$$4\frac{4}{9}$$