Given:
The ratio of speed is given as.
[tex]\frac{3\text{ mies}}{\frac{1}{2}\text{ hours}}[/tex]The objective is to convert the ratio into unit ratio.
The unit ratio can be calculated by multiplying 2 on numerator and denominator, so that the denominator will become one.
[tex]\begin{gathered} \frac{3\times2\text{ miles}}{\frac{1}{2}\times2\text{ hour}} \\ \frac{6\text{ miles}}{1\text{ hour}}\text{ } \\ 6\text{ miles/hour} \end{gathered}[/tex]Hence, the unit ratio is 6 miles/hour.