A car is traveling from City A to City B. The graph shows the remaining distance, in miles, to City B as a function of the time, in hours, since the car started its journey. What does the x-intercept of the graph represent in this context?
[Graph Description: A line segment starts at (0, 200) and goes down to (5, 0). The x-axis is 'Time (hours)' from 0 to 6. The y-axis is 'Remaining Distance (miles)' from 0 to 250. The line passes through (1, 160), (2, 120), (3, 80), (4, 40).]
The car's speed in miles per hour.
The total distance between City A and City B.
The time it takes for the car to reach City B.
The remaining distance after 1 hour of travel.
