Final answer:
To find the average speed, divide the distance of 90 miles by the travel time of 1.5 hours. This calculation yields an average speed of 60 miles per hour (mph).
Step-by-step explanation:
The formula to find average speed is average speed = distance traveled / time of travel. In this case, the distance traveled (d) is 90 miles and the time of travel (t) is 1.5 hours. So, we can calculate the average speed as follows:
Calculation
Average speed = distance / time
= 90 miles / 1.5 hours
Result
After performing the division, we find that the average speed is 60 miles per hour (mph).
This is similar to the example where a car travels 150 kilometers in 3.2 hours, resulting in an average speed of 47 km/h. Calculating average speed is a straightforward process that involves dividing the total distance by the total time taken.