Final answer:
The average speed of a car traveling from Los Angeles to Las Vegas over a distance of 280 miles in 4 hours is 70 miles per hour.
Step-by-step explanation:
To calculate the average speed of a car journey from Los Angeles, CA, to Las Vegas, NV, we use the formula for average speed which is the total distance traveled divided by the total time taken. In this case, the car travels 280 miles and it takes approximately 4 hours to complete the journey. The calculation for the average speed would be:
Average Speed = Total Distance ÷ Total Time
Average Speed = 280 miles ÷ 4 hours = 70 miles per hour (mph).
Thus, the average speed of the car on this trip would be 70 mph.