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Kurt earns $60/2 units of time = $30/ unit of time compared to Paul who earns $40 per unit of time.
The ratio of Kurt's pay to Paul's pay = 30/40 = 3/4.
For additional explanation on Ratio and Proportion, please see my own website. Look for the easy-to-remember and easy-to-spell link www.mathinlivingcolor.com. At the bottom of this page is a link that takes you to my Homepage. Near the top of the Homepage, look for the link: "Basic, Intermediate, and College Algebra: One Step at a Time." Choose "Basic Algebra" and look in Chapter 1, for Section 3.08.
You will probably like my explanations, especially the PRICE of them!! They are ALL FREE!! My own students before my retirement thought my books were easier to understand than the traditional books, and many of the solutions are given IN COLOR in the attached "Math in Living Color" pages.
Most any algebra topic you need is probably there somewhere. If you need help finding the right page on the website, please send me an Email at email@example.com. If you like my website, please recommend it to family and friends.
Dr. Robert J. Rapalje, Retired
Seminole State College of Florida