Resposta :
[tex]\Large\displaystyle\text{$\begin{gathered} \sf{V_m=\frac{\Delta S}{\Delta t} } \end{gathered}$}[/tex]
[tex]\Large\displaystyle\text{$\begin{gathered} \sf{ V_m=\frac{1800\,m}{150\,s}} \end{gathered}$}[/tex]
[tex]\Large\displaystyle\text{$\begin{gathered} \boxed{\boxed{\sf{ V_m=12\,m/s}}} \end{gathered}$}[/tex]