A car travels the first half of a 200-mile trip at 40 mph and the second half at 60 mph. What is the car's average speed for the entire trip?

✓ Correct Answer: Option A

The first 100 miles take 100/40 = 2.5 hours. The next 100 miles take 100/60 = 5/3 hours. Total time = 2.5 + 5/3 = 25/6 hours. Average speed = Total distance / Total time = 200 / (25/6) = 48 mph.