13. As shown in the figure, a car is traveling due west on a horizontal road. At point $A$, the mountain peak $D$ on the north side of the road is measured to be in the direction $30°$ west of north. After traveling 600 m to reach point $B$, the peak is measured to be in the direction $75°$ west of north with an elevation angle of $30°$. The height of the mountain $CD = $ $\_\_\_\_$ m.

\begin{figure}[h]
\begin{center}
  \includegraphics[alt={},max width=\textwidth]{f4ed9abf-f372-4cdd-9444-bf8160694ac3-03_394_565_918_397}
\captionsetup{labelformat=empty}
\caption{Figure for Question 13}
\end{center}
\end{figure}

\begin{figure}[h]
\begin{center}
  \includegraphics[alt={},max width=\textwidth]{f4ed9abf-f372-4cdd-9444-bf8160694ac3-03_481_460_863_1137}
\captionsetup{labelformat=empty}
\caption{Figure for Question 14}
\end{center}
\end{figure}