The first thing we have to do is identify our input units and output units in order to know the conversions.
[tex]\begin{gathered} 1\operatorname{km}\to1000m \\ 1h\to60\min \\ 1\min \to1s \end{gathered}[/tex]
Time to find the average speed of the car that travels 190m in 18s we have to divide them
[tex]speed=\frac{distance}{time}[/tex][tex]\begin{gathered} s=\frac{190m}{18s} \\ s=10.55\frac{m}{s} \end{gathered}[/tex]
We already have our average speed in meters per second, we convert them to time using the aforementioned conversions
[tex]\begin{gathered} 10.55\frac{m}{s}\times\frac{1\operatorname{km}}{1000m}=0.010556\frac{\operatorname{km}}{s} \\ \\ \end{gathered}[/tex][tex]0.010556\frac{\operatorname{km}}{s}\times\frac{60s}{1\min}=0.633\frac{\operatorname{km}}{\min }[/tex][tex]0.633\frac{\operatorname{km}}{\min}\times\frac{60\min}{1h}=38\frac{\operatorname{km}}{h}[/tex]
The answer is: The car travels at an average speed of 38 km/h.
