Answer:
60 miles per hour
Explanation:
We need to simply divide the total distance he traveled by the total time it took him.
At 10:00 AM, he is 200 miles from New York.
At 12:00 PM, he is 80 miles from New York.
This means that 2 hours has elapsed and the distance he has traveled is:
200 - 80 = 120 miles
Therefore, his average speed is:
120 / 2 = 60 miles per hour