wikiHow Calculating Average Speed Practice Answers 1. 6 mph 2. 30 mph 3. 10 mph 4. 100 mph 5. 500 mph 6. 15 mph 7. 3 mph 8. 100 km/h 9. 15 km/h 10. 10 km/h 11. 50 mph 12. 5 km/h 13. 15 mph 14. 100 km/h 15. 500 km/h 16. 15 mph 17. 100 km/h 18. 5 mph 19. 50 km/h 20. 4 mph Note: The answers are rounded to the nearest whole number. Page