SAT Question 68f2cbaf: Linear Inequalities answer and explanation with Desmos solution

Choice B is correct. It's given that Ty plans to walk at an average speed of $4$ kilometers per hour. The number of kilometers Ty will walk is determined by the expression $4s$, where $s$ is the number of hours Ty walks. The given goal of at least $24$ kilometers means that the inequality $4s\ge 24$ represents the situation. Dividing both sides of this inequality by $4$ gives $s\ge 6$, which corresponds to a minimum of $6$ hours Ty must walk.