Zachary traveled from city A to city B. He left city A at 7:30 a.m. and reached city B at 12 noon. Find the average speed if city B is 180 miles away from city A.

4.5 hours

180 miles

speed = 180/4.5 miles/hour

To find the average speed, we need to divide the total distance traveled by the time it took to travel that distance.

First, let's find the time it took to travel from city A to city B. Zachary left city A at 7:30 a.m. and reached city B at 12 noon. The time elapsed from 7:30 a.m. to 12 noon is 4 hours and 30 minutes.

Next, let's convert this time into hours. Since there are 60 minutes in an hour, we can divide the 30 minutes by 60 to get a fraction of an hour. Therefore, the time taken is 4.5 hours.

Now, we can calculate the average speed by dividing the distance traveled by the time taken. Zachary traveled 180 miles, and it took him 4.5 hours.

Average Speed = Distance / Time
Average Speed = 180 miles / 4.5 hours
Average Speed = 40 miles per hour

Therefore, the average speed of Zachary's travel from city A to city B is 40 miles per hour.