A can lay a railway track between two givens stations in 16 days and B can do the same job in 12 days. With the help of C, they can do the job in 4 days. Then, C alone can do the job in
1
\(9\frac{1}{5}\) days
2
\(9\frac{2}{5}\) days
3
\(9\frac{3}{5}\) days
4
10 days