Respuesta :

[tex]\bf \begin{array}{ccll} \stackrel{map}{inches}&\stackrel{actual}{feet}\\ \cline{1-2} 3&20\\ x&12 \end{array}\implies \cfrac{3}{x}=\cfrac{20}{12}\implies \cfrac{3\cdot 12}{20}=x\implies \cfrac{9}{5}=x\implies 1\frac{4}{5}=x[/tex]