Gotta add a picture to show us what you want us to do.
Answer:
8.06 inches
Step-by-step explanation:
The diagram shows a rectangle with width of 4 inches and area of 28 square inches.
Use area formula:

So,

By the Pythagorean theorem,

Times them all :) and that's your answer
i calculated that the answer will be roughly 24.9 miles per hour.