Question

Peyton is a sprinter who can run the 40-yard dash in 4.5 seconds. He converts his speed into miles per hour

Answer 1

According to the given situation, the ratio that is incorrectly wrriten is the second one:

`(5280ft)/(1mi)`

We know this because when using this kind of conversion ratios the idea is to cancel units. If the feet are in the numerator they will not be canceled with the feet of the last factor since they are also in the numerator. The feet should be in the denominator in this ratio.