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?
1
\(3\frac{1}{8}\)
2
\(5\frac{1}{8}\)
3
\(6\frac{1}{8}\)
4
\(\frac{2}{3}\)