SAT Question f6cbb04a: Ratios Rates Proportional Relationships And Units answer and explanation with Desmos solution

Choice A is correct. Since the distance is equal to the amount of time multiplied by a constant, the given equation $d=55t$ represents a proportional relationship between distance and time in this situation. Since $9k=3\times 3k$, the time when $t=9k$ hours is $3$ times the time when $t=3k$ hours. Therefore, the distance traveled after $9k$ hours is $3$ times the distance after $3k$ hours.