A can do a certain work in 15 days. B is 25% more efficient than A. Both worked together for 4 days. C alone completed the remaining work in 8 days. A, B and C together will complete the same work in ?
1
5 days
2
\(4\frac{1}{2}\) days
3
\(6\frac{1}{2}\) days
4
4 days