${{v}_{0}}=108\frac{km}{h}=30\frac{m}{s}$ $v=at+{{v}_{0}}\Rightarrow 0=-2t+30\Rightarrow t=15s$$\Delta x=\frac{1}{2}a{{t}^{2}}+{{v}_{0}}t$ $\Rightarrow \left\{ \begin{align}  & \Delta {{x}_{15}}=\frac{1}{2}(-2)\times {{(15)}^{2}}+30\times 15=225m \\  & \Delta {{x}_{13}}=\frac{1}{2}(-2)\times {{(13)}^{2}}+30\times 13=221m \\ \end{align} \right.$