APPSC Group-I Preliminary Exam 2003 Solved Paper

$\mathit{A}$ and $\mathit{B}$ are standing at a distance of $20\mathit{k}\mathit{m}$ from each other on a straight East-west Road. $\mathit{A}$ and $\mathit{B}$ start walking simultaneously, eastwards and westwards respectively, and both cover a distance of 5km. Then A turns to his left and walls $10\mathit{k}\mathit{m}$. B turns to his right and walls $10\mathit{k}\mathit{m}$ at the same speed. Then both turn to their left and cover a distance of $5\mathit{k}\mathit{m}$ at the same speed. What will be the distance between them?