Question

A fast car travels 420 miles in a period of 210 minutes. What is the adverage rate of change of distance of the car in miles per hour over this time period?

Answer 1

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

420 miles ... 210 minutes
x miles = ? ... 1 hour = 60 minutes

420 * 60 = 210 * x
x = 420 * 60 / 210
x = 120 miles

The correct result would be 120 miles per hour.