Respuesta :
[tex]\bf \begin{array}{ccll}
miles&hours\\
\text{\textemdash\textemdash\textemdash}&\text{\textemdash\textemdash\textemdash}\\
7&1\\
m&4
\end{array}\implies \cfrac{7}{m}=\cfrac{1}{4}\implies \cfrac{7\cdot 4}{1}=m[/tex]