Troy travels 100 miles in 2 hours. Find the unit rate of speed by filling in the missing number.

$\displaystyle\frac{{{100}\ \text{ miles}}}{{{2}\ \text{ hours}}}=\frac{{\text{?}\ \text{ miles}}}{{{1}\ \text{ hour}}}=\text{? }\ \frac{{\text{miles}}}{{\text{hour}}}\usepackage{cmbright}\Huge\$