Question 1098039
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<pre>
Let x be the speed (the rate) of the slower car, in miles per hour.

Then the speed of the faster car is (x+12) mph.


The equation is

6x + 6*(x+12) = 648   ====>

6x + 6x + 72 = 648  ====>  12x = 648 - 72 = 576  ====>  x = {{{576/12}}} = 48.


<U>Answer</U>.  The speed of the slower car was 48 mph.  The speed of the faster car was 48 + 12 = 60 mph.
</pre>

Solved.



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