Question 970914
C goes 50 mph
M goes at 65 mph
hours for C is x
hours for M is 6-x

50x+65 (6-x)=360   mph *hours=miles

50x+390-65x=360

-15x= -30
x=2

Carlos drove 2 hours and 100 miles

Maria drove 4 hours and 260 miles

You could do this with x and y
x+y=6
50x +65y=360

I like using only one variable.