Harry and his wizard friends measured the lengths of their magic wands. \begin{tabular}{|c|c|}
\hline
Wand & Length \\
\hline
Harry & 29 \text{ cm} \\
Ron & 24 \text{ cm} \\
Hermione & 31 \text{ cm} \\
Ginny & 26 \text{ cm} \\
\hline
\end{tabular} What is the length of Harry and Ron's wand together?