Calculating the average speed during this time interval is the same as calculating how many km he traveled per hour.
This is also the same thing as the unit rate. Do that division and find that he traveled 100 km/hr.
Average speed = 100 km/h
Total distance covered = 250 km
Total time taken = 8:30 am - 6:00 am = 2:30 hours = 2.5
⇒ Average speed = Total distance covered / Total time taken
⇒ Average speed = 250 / 2.5
⇒ Average speed = 100 km/h
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