Studying for a math test, don't understand this problem?

[aosekw]

A Jaguar travelled 1.2 times as fast as a Mercedes. The difference in their speeds was 24km/h. What was the speed of each car?

I need to make an equation to solve this? What would that look like?

 

[Gary B]

x-24=y
x=1.2y
x/1.2=y
x-24=x/1.2
-24=x/1.2-x
-24=x(1/1.2 - 1)
-24/(1/1.2-1)=x
144=x
144-24=y
120=y
144 &120