A can build up a wall in 8 days while B can break it in 3 days. A has worked for 4 days and then B joined to work with A for another 2 days only. In how many days will A alone build up the remaining part of the wall ?

• A. ${\text{6}}\frac{1}{3}{\text{ days}}$$
• B. days
• C. ${\text{7}}\frac{1}{3}{\text{ days}}$$
• D. ${\text{13}}\frac{1}{3}{\text{ days}}$$