Resposta :
[tex]\Large\displaystyle\text{$\begin{gathered} \tt V_m=\dfrac{\Delta S}{\Delta t}\end{gathered}$}[/tex]
[tex]\Large\displaystyle\text{$\begin{gathered} \tt V_m=\dfrac{1800}{60}\end{gathered}$}[/tex]
[tex]\Large\displaystyle\text{$\begin{gathered}\boxed{ \tt V_m=30\,m/s}\end{gathered}$}[/tex]