If a vehicle travels 628 miles in 2 hours, what is its average speed?

To determine the average speed of the vehicle, you can use the formula for average speed, which is total distance traveled divided by the total time taken. In this case, the vehicle travels 628 miles in 2 hours.

Calculating the average speed involves dividing 628 miles by 2 hours:

Average Speed = Total Distance / Total Time

Average Speed = 628 miles / 2 hours = 314 miles per hour.

Thus, the average speed of the vehicle is 314 miles per hour, which corresponds to the provided answer of D.

This calculation accurately reflects the distance covered over a specific time period, providing the average speed directly in miles per hour as intended.