Given that the distance is d = 72 km and the time is t = 1 hour.
We have to find the speed in m/s.
First, we have to convert the unit of distance in m and the unit of time in seconds.
The distance will be
[tex]\begin{gathered} d=72\times1000\text{ m} \\ =72000\text{ m} \end{gathered}[/tex]The time will be
[tex]\begin{gathered} t=\text{ 1}\times60\times60 \\ =3600\text{ s} \end{gathered}[/tex]The speed can be calculated by the formula
[tex]v=\frac{d}{t}[/tex]Substituting the values, the speed will be
[tex]\begin{gathered} v=\frac{72000}{3600} \\ =20\text{ m/s} \end{gathered}[/tex]Thus, the speed of the car is 20 m/s
