To calculate Cesar's speed we need to divide the distance travelled by him by the elapsed time. On this case we have:
[tex]\begin{gathered} v=\frac{d}{t} \\ v=\frac{9\frac{2}{3}}{15} \\ v=\frac{9+\frac{2}{3}}{15} \\ v=\frac{\frac{29}{3}}{15} \\ v=\frac{29}{3}\cdot\frac{1}{15} \\ v=\frac{29}{45}\text{ = }0.64\text{ miles per minute} \end{gathered}[/tex]Cesar's speed is equal to 0.64 miles per minute or 29/45 miles per minute.
