[tex]\bf \begin{array}{ccllll}
acres&hour\\
\text{\textemdash\textemdash\textemdash}&\text{\textemdash\textemdash\textemdash}\\
\frac{1}{6}&\frac{1}{4}\\\\
a&1
\end{array}\implies \cfrac{\frac{1}{6}}{a}=\cfrac{\frac{1}{4}}{1}\implies \cfrac{\frac{1}{6}}{\frac{a}{1}}=\cfrac{\frac{1}{4}}{\frac{1}{1}}\implies \cfrac{1}{6}\cdot \cfrac{1}{a}=\cfrac{1}{4}\cdot \cfrac{1}{1}
\\\\\\
\cfrac{1}{6a}=\cfrac{1}{4}\implies 4=6a\implies \cfrac{4}{6}=a\implies \cfrac{2}{3}=a[/tex]
