Question 1346
 Assume the speed of car one is x mph, 
 then the speed of car two is x-2 mph.

 When they travel in the opposite direction,
 distance = sum of two speed * Time, 
 So,  168 = (x+x-2)* (3/2) = 3x -3,
 or 3x = 171, x = 57 and x-2 = 55.

 Answer: speed of car 1 is 57 MPH,
  speed of car 2 is 55 MPH