Given data,
Distance travelled by pete.
[tex]d=150\text{ m}[/tex]Time taken by pete.
[tex]t=18\text{ sec}[/tex]Consider the formula for speed.
[tex]s=\frac{d}{t}[/tex]Substitute the given values.
[tex]\begin{gathered} s=\frac{150\text{ m}}{18\text{ sec}} \\ s=8.3\text{ m/sec.} \end{gathered}[/tex]Therefore, the average speed in m/s is 8.3 m/sec.