A, B and C can complete a work in 10 days, 15 days and 20 days. They started the work together but A and B left the work 3 days before completion of the work. Find the total time taken to complete the work?
1
\(6{2 \over 3}\)
2
\(11{12 \over 13}\)
3
\(6{12 \over 13}\)
4
\(9{12 \over 13}\)