A and B can do a piece of work in 16 days & 10 days. A started the work and after 4 days, B also join him till the completion of the work. How many days they will will take to complete the entire work
1
\(8\frac{12}{13}\)
2
\(12\frac{8}{13}\)
3
\(12\frac{12}{13}\)
4
\(8\frac{8}{13}\)