A, B & C can do work in 15, 20 & 30 days. A works for whole time, every third day B & C together work with A. The work completed in how many days?
1
\( 11\frac{1}{9}\ days\)
2
\(11\frac{7}{9}\ days\)
3
\(11\frac{2}{9}\ days\)
4
\(11\frac{3}{9}\ days\)