Answer:
18.33 mph
Step-by-step explanation:
The average speed of an object is defined as the total distance traveled by the object divided by the total time taken to cover the distance.
Average speed = total distance traveled/total time taken
Also, the speed of an object is defined as the distance covered by the object within a specific period.
Speed = distance/time.
Hence, speed of the journey = 55 = distance/2
Distance covered = 55 x 2 = 110 miles
Total time from 6 AM to 12 noon = 6 hours
Average speed = 110/6
= 18.33 mph
The average speed over the time interval from 6 AM to noon is 18.33 mph.