8/12 + 6/x = 1
X = 18 days
A can do a piece of work in 12 days. When he had worked for 2 days B joins him. If the complete work was finished in 8 days. In how many days B alone can finish the work?
[A] 18 days
[B] 11 days
[C] 77 days
[D] 188 days
[E] 66 days