[tex]\bf \begin{array}{ccllll}
read&minutes\\
\textendash\textendash\textendash\textendash\textendash\textendash&\textendash\textendash\textendash\textendash\textendash\textendash\\
\frac{2}{5}&45\\
x&70
\end{array}\implies \cfrac{\frac{2}{5}}{x}=\cfrac{45}{70}\implies \cfrac{\frac{2}{5}}{\frac{x}{1}}=\cfrac{45}{70}
\\\\\\
\cfrac{2}{5}\cdot \cfrac{1}{x}=\cfrac{45}{70}\implies \cfrac{2}{5x}=\cfrac{45}{70}[/tex]
solve for "x"
