[tex]\bf 3\frac{2}{5}\implies \cfrac{3\cdot 5+2}{5}\implies \cfrac{17}{5}\\\\
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\cfrac{3\frac{2}{5}~mi}{\frac{7}{8}~hr}\implies \cfrac{\frac{17}{5}~mi}{\frac{7}{8}~hr}\implies \cfrac{17}{5}mi\cdot \cfrac{8}{7}hr\implies \cfrac{17\cdot 8~mi}{5\cdot 7~hr}\implies \cfrac{136~mi}{35~hr}
\\\\\\
\textit{which is rougly }\approx 3.886\frac{mi}{hr}[/tex]
