## Algebra 2 (1st Edition)

Given, relevant information: 30 kilometers were traveled in 8 minutes. The formula for speed (represented by the variable $r$) is $r=\frac{d}{t}$ The variable $d$ represents the distance traveled, and the variable $t$ represents the time spent traveling. If we substitute these known variables into the equation, $r=\frac{30}{8}$. When simplified, this fraction is equivalent to $\frac{15}{4}$, which is equal to $3.75$. Thus, the train was traveling at an average speed of 3.75 kilometers per hour.