A marathon runner runs 4 miles in 20 minutes. In terms of miles per hour, how fast is she running?

12 miles per hour

Step-by-step explanation:

4 miles in 20 minutes is equivalent to 4*3=12 miles in 20*3=60 minutes, or 12 miles per hour.

days of the week

step-by-step explanation:

javier earned more money then kyle, so that won't always be a constant term, but the days of the week do not change so that term is always constant.

edit: i meant