Ted was driving at a speed of 80 miles/hour.
Step-by-step explanation
Suppose, the speed of Ted is
miles/hour.
Relationship between Distance, Speed and Time is....

Given that, the total distance was 482 miles and it took him 6 hours.
So, according to the above formula....

So, the speed of Ted after rounding to the nearest whole number will be 80 miles/hour.