What is the term for a ratio of equivalent measurements that can be used to change a value from one unit into another?

Jessica is a custodian at oracle arena. she waxes 20 m2 of the floor in 3/5 of an hour. jessica waxes the floor at a constant rate. at this rate how many sqaures meters can she wax per hour

Iam a rectangle. my perimeter is 60 feet. how much are do i cover?

In trapezoid abcd, ac is a diagonal and ∠abc≅∠acd. find ac if the lengths of the bases bc and ad are 12m and 27m respectively.