The rule of the speed is
[tex]s=\frac{d}{t}[/tex]
d is the distance
t is the time
Since you took 45 seconds to go to the science class, then
t = 45 sec
Since the distance from the social studies class is 90 meters, then
d = 90 m
Substitute them in the rule above to find your speed
[tex]\begin{gathered} s=\frac{90}{45} \\ s=2\text{ m/sec} \end{gathered}[/tex]
Your speed is 2 m per sec
