A rate is a ratio that compares two related quantities. Common rates are speed = \({distance \over time}\), flow = \({amount \over time}\), and defect = \({errors \over units}\).
What is the distance in miles of a trip that takes 4 hours at an average speed of 55 miles per hour?
| 60 miles | |
| 450 miles | |
| 315 miles | |
| 220 miles |