Final answer:
Point X with a coordinate of three on a graph representing commuter train speed signifies either distance traveled or time taken, depending on the axes of the graph. In similar problems, such as calculating the average speed of a train between two cities, we consider total distance and time to get the average speed in m/s.
Step-by-step explanation:
To determine the meaning of the point with an X coordinate of three on the graph showing a commuter train's speed, we need to interpret the graph correctly. However, in the case provided as a reference, there's an example that can help us understand how to approach such problems. For a train traveling a certain distance over a given period, we can calculate its average speed and average velocity. As an example, a commuter train travels between Baltimore and Washington, DC, which are 40 miles apart, back and forth in 1 hour and 45 minutes. The average velocity is calculated considering the displacement over time, while the average speed involves the total distance covered over the travel time.
For point X with a coordinate of three, we would typically interpret it in terms of the context provided by the graph, such as distance over time. Without the specific graph, we can't give a definitive answer to the question posed, but we can surmise that the point may represent a distance traveled or time taken, depending on the graph's axes.