$\begin{align}  & \left. \begin{matrix}   \Delta x={{v}_{s}}\times {{t}_{s}}  \\   \Delta x={{v}_{P}}\times {{t}_{P}}  \\\end{matrix} \right\}\xrightarrow{{{t}_{P}}={{t}_{s}}-180}5000\times {{t}_{s}}=10000\times ({{t}_{s}}-180) \\  & \Rightarrow {{t}_{s}}=\frac{1800000}{5000}=360s \\  & \Rightarrow \Delta x={{v}_{s}}\times {{t}_{s}}=5\times 360=1800km \\ \end{align}$