A and B can do a piece of work in 5 days and 10 days, respectively. They began the work together but A left after some days and B finished the remaining work in 8 days. After how many days did A leave?

A

$$3\frac{1}{8}$$

B

$$5\frac{1}{8}$$

C

$$6\frac{1}{8}$$

D

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