One tire has a diameter of 7 in and another has a diameter of 12 in. What is the difference in the distance the tires make in two revolutions?

Question

I don't get the question could you explain?

Answer 1

the circumference of the tire is the distance it moves in one revolution.

So, what are the circumferences of the two tires?

You want the difference, times 2 (for two revolutions)