[tex]\bf \cfrac{\quad 3\frac{1}{2}~miles\quad }{\frac{1}{2}~hour}\implies \cfrac{\quad \frac{3\cdot 2+1}{2}~miles\quad }{\frac{1}{2}~hour}\implies \cfrac{\quad \frac{7}{2}~miles\quad }{\frac{1}{2}~hour}
\\\\\\
\cfrac{7}{\underline{2}}~miles\cdot \cfrac{\underline{2}}{1}~hour\implies 7\frac{miles}{hour}[/tex]
