Step 1 :Assume Car A is driving at a constant speed of 60 mph and Car B is driving at a constant speed of 70 mph.
Step 2 :Calculate the time it takes for Car A to reach the next spotlight using the formula: Time = Distance / Speed
Step 3 :For Car A: Time taken = 120 miles / 60 mph = 2 hours
Step 4 :Calculate the time it takes for Car B to reach the next spotlight using the same formula.
Step 5 :For Car B: Time taken = 120 miles / 70 mph ≈ 1.714 hours (rounded to 3 decimal places)
Step 6 :Compare the time taken for Car A and Car B.
Step 7 :Since the time taken for Car A is 2 hours and the time taken for Car B is approximately 1.714 hours, we can conclude that at any given point in time, the two cars are not traveling at the same speed.
Step 8 :Therefore, the answer to the question is: \(\boxed{c. No}\)