The distance from Phoenix to Tucson is 120 miles. A car made the journey in 1 hour and 45 minutes. What was the average speed of the car in miles per hour?

If you would like to know the average speed of the car in miles per hour, you can calculate this using the following steps:

120 miles ... 1 hour and 45 minutes = 105 minutes

x miles = ? ... 1 hour = 60 minutes

120 * 60 = x * 105

x = 120 * 60 / 105

x = 68.57 miles

The correct result would be 68.57 miles per hour.