SAT Question 4837406c: Ratios Rates Proportional Relationships And Units answer and explanation with Desmos solution

It's given that the object travels at a constant speed of $6$ centimeters per second. The speed of the object can be written as $\frac{6\text{centimeters}}{1\text{second}}$. Let $x$ represent the time, in seconds, it would take for the object to travel $24$ centimeters. The value of $x$ can be calculated by solving the equation $\frac{6\text{centimeters}}{1\text{second}}=\frac{24\text{centimeters}}{x\text{seconds}}$, which can be written as $\frac{6}{1}=\frac{24}{x}$, or $6=\frac{24}{x}$. Multiplying each side of this equation by $x$ yields $6x=24$. Dividing each side of this equation by $6$ yields $x=4$. Therefore, it would take the object $4$ seconds to travel $24$ centimeters.