Answer :

[tex]\frac{120\ mi}{1\frac{3}{4}\ h}=\frac{120}{\frac{7}{4}}\ mi/h=\left(120\times\frac{4}{7}\right)\ mph=\frac{480}{7}\ mph=68\frac{4}{7}\ mph\approx68.5\ mph[/tex]

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