Algebra 1

If it takes you 12 minutes to go 2.5 miles, you can convert minutes to hours by changing it to $\frac{12}{60}$, which can be simplified to $\frac{1}{5}$. Therefore, you travelled 2.5 miles in 0.2 hours. From there, you can solve by dividing 2.5 miles by 0.2 hours. $2.5\div0.2=12.5$ You were traveling at 12.5 miles per hour.