Question 374821
Two cars start from the same point at the same time and travel in opposite directions. The fastest car travels 12 miles per hour faster than the other. If after 6 hours, the cars are 648 km apart, what is the speed of each car?

Let x = the speed of the slower car
x + 12= the speed of the faster car

6(x + x+12) = 648
      12x+72= 648
       12x  = 576
         x  = 48

      x+12  = 48+12 = 60

The speed of the slower car is 48mph while the speed of the faster car is 60mph.