SAT Question 3c8fdc40: Ratios Rates Proportional Relationships And Units answer and explanation with Desmos solution

There are $60$ minutes in one hour. At a rate of $42$ posters per minute, the number of posters produced in one hour can be determined by $\left(\frac{42\text{posters}}{1\text{minute}}\right)\left(\frac{60\text{minutes}}{1\text{hour}}\right)$, which is $2,520$ posters per hour.