TS ICET 19 Aug 2021 Shift 2 Paper

Two persons $\mathit{A}$ and $\mathit{B}$ working together can complete a task in $7\frac{1}{2}$ days. B alone takes 8 days less than $\mathit{A}$ alone to complete the task. If another person $\mathit{C}$ alone takes 14 days to complete the task, then the difference between the number of days needed by B alone and C alone to complete the task is