A woman runs $2.0\,\text{km}$ from $X$ to $Y$ in $20\,\text{minutes}$, then remains at $Y$ for $10\,\text{minutes}$. After that, she takes $10\,\text{minutes}$ to run $1.6\,\text{km}$ from $Y$ to $Z$. Determine the magnitude of her average velocity for the journey from $X$ to $Z$?
- A$0.060\,\text{km minute}^{-1}$
- B$0.080\,\text{km minute}^{-1}$
- C$0.090\,\text{km minute}^{-1}$
- D$0.130\,\text{km minute}^{-1}$