To find out how fast you were going, you can use the formula for speed, which is:
Speed = Distance / Time
In this case, the distance traveled is 100 miles, and the time taken is 4 hours. Plugging these values into the formula gives:
Speed = 100 miles / 4 hours = 25 miles per hour
Therefore, if you traveled 100 miles in four hours, your speed was 25 miles per hour.