I have a quiz coming up in my Geometry class and my teacher has hinted that there will be a question like this one on the quiz:

"Ashley saved a distance equal to 80% of the length of the shortest side of a rectangular field by cutting across the diagonal of the field instead of along two sides. Find the ratio of the length of the shortest side of the field to the length of its longest side."

I tried working on it with a friend of mine but we don't even know how to set it up (much to my embarrassment.) I need help to solve this question. Please help me ASAP because I believe the quiz will be in two days. Any info that can help will work.

Thanks.