Two trucks leave a warehouse at the same time. One travels due south at an average speed of 48 miles per hour, and the other travels due north at an average speed of 47 miles per hour. After how many hours will the two trucks be 427.5 miles apart?

after 4.5 hours the trucks will be 427.5 miles apart (see picture)

What is the diagram u didn't post that

When rates are expressed as a quantity of 1, such as 2 feet per second or 5 miles per hour, they are called unit rates. if you have a multiple-unit rate such as 120 students for every 3 buses, and want to find the single-unit rate, write a ratio equal to the multiple-unit rate with 1 as the second term.