[tex]\begin{gathered} Let\text{ us first change the mix fractions to fractions} \\ 3\frac{1}{4}=\frac{12+1}{4}=\frac{13}{4} \\ 2\frac{1}{2}=\frac{4+1}{2}=\frac{5}{2} \\ \text{Now we can divide without fear the fractions} \\ \frac{\frac{13}{4}}{\frac{5}{2}}=\frac{13}{4}\cdot\frac{2}{5}=\frac{26}{20}=\frac{13}{10}=1\frac{3}{10}\text{ inches per hour} \end{gathered}[/tex]
