Amit drove for 6 hours at a speed of 60 miles per hour and for 6 hours at 40 miles per hour. What was his average speed (in miles per hour) for the whole journey?

Correct option is D

Distance at 60 mph: 6 hours × 60 mph = 360 miles

Distance at 40 mph: 6 hours × 40 mph = 240 miles
Total distance: 360 miles + 240 miles = 600 miles
Total time: 6 hours + 6 hours = 12 hours
- Average speed = $$\frac{Total\, distance }{Total\, time}$$​​
- Average speed = 600 miles / 12 hours = 50.0 mph