The graph is a straight line. Its slope is the speed.
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A horizontal line on a speed vs time graph indicates constant speed.
That kind of depends on what is being graphed. -- On a graph of acceleration vs time, the graph is a straight line that lays right on top of the x-axis, because the acceleration is a constant zero. -- On a graph of speed vs time, constant speed is a horizontal line, parallel to the x-axis. -- On a graph of distance vs time, constant speed is a straight line with a positive slope; that is, it rises as it progresses toward the right.
yes
straight line
By using the distance, speed, and acceleration, to show on the graph the constant speed of each car