distance - time graph which line has the fastest speed? a none b c

distance - time graph which line has the fastest speed? a none b c
Answer
Explanation:
Step1: Recall speed - distance - time relation
Speed is given by the slope of the distance - time graph ($s=\frac{d}{t}$, where $s$ is speed, $d$ is distance and $t$ is time). A steeper slope indicates a higher speed.
Step2: Compare slopes of lines
Line A has the steepest slope among lines A, B and C on the distance - time graph.
Answer:
A. A