Originally Posted by born

I would say "D"...

Here is how I got it:

You don't know the amount of time so call that 'x'

one car going 40mph and the other going 60mph and a total of 180miles

so
(40MPH *Time(X)) + (60MPH *Time(X)) = 180 miles
40X + 60X =180

100X = 180

X=1.8hours

0.8 hours equals 48minutes (0.8 X 60) so total time is 1.8hours or 1hour and 48minutes

Proof: (40)1.8 + 60(1.8) = 180miles
That means 40MPH car went a total of 72miles and the 60MPH car went 108miles = Total distance apart is 180miles

Hope this helps..

B-