1200 m / 1000 = 1,2 km
20 m / 60 = 0,33 h
v = d / t
v = 1,2 / 0,33
v = 3,7 km/h √
[tex]\Large\displaystyle\text{$\begin{gathered} \sf{ 1200\,m\rightarrow1{,}2\,km} \end{gathered}$}[/tex]
[tex]\Large\displaystyle\text{$\begin{gathered} \sf{ 20\,min\rightarrow\frac{1}{3}\,h} \end{gathered}$}[/tex]
[tex]\Large\displaystyle\text{$\begin{gathered} \sf{V_m=\frac{\Delta S}{\Delta t} } \end{gathered}$}[/tex]
[tex]\Large\displaystyle\text{$\begin{gathered} \sf{ V_m=\frac{1{,}2\,km}{\dfrac{1}{3}\,h}} \end{gathered}$}[/tex]
[tex]\Large\displaystyle\text{$\begin{gathered}\boxed{\boxed{ \sf{ V_m=3{,}6\,km/h }}}\end{gathered}$}[/tex]
