problem: At her track meet, Alice ran at a speed of $9\ \text{m/s}$ for $12$ seconds. How many meters did she run?
solution: Letting $v$ denote speed, $x$ denote distance, and $t$ denote time, we have $v=\frac{x}{t}$. In our problem, we're given that $v=9\ \text{m/s}$ and $t=12\ \text{s}$. Solving for the distance, we find that $x=vt=\boxed{108}\ \text{m}$.