A can do \(66\frac{2}{3}\%\) of a work in 8 days. B is 40% less efficient than A. The two work together for 5 days and then both leave. C completes the remaining work in 6 days. In how many days can A and C together complete the original work?
1
\(9\frac{9}{19}\)
2
\(8\frac{8}{19}\)
3
\(7\frac{1}{2}\)
4
\(7\frac{1}{5}\)