Step-by-step explanation:
So the 1st section is the like the linear equation. (You know what I mean, right?) And they're adding up for the same rate. The 1st one is 8 1/2, and the 2nd one will be 8 1/2 * 2 and so on.
For the 2nd section, just do this: distance / time, and you will get the rate of a minute. I'll do the 1st one. 3 1/2 divide 1 1/2 = 7/2 divide 3/2 = 7/2 * 2/3 = 14/6 = 7/3 (Remember, she's in elementary, so the amount has to be the smallest)
On section 3, same thing, make the unit of each side to 1 unit, and we can see which one is lower easily.
