Final answer:
The x-intercept represents the point where the line crosses the x-axis. In this context, it should be associated with the time it takes to reach the bus stop where the distance is zero, which is (27, 0).
Step-by-step explanation:
The x-intercept of a graph is the point where the line crosses the x-axis, which means the y-value is 0 at that point. On a position vs. time graph for a moving object, the x-intercept would represent the time it takes for the object to reach a certain position if the position is being plotted on the y-axis. Conversely, if the position is on the x-axis and time on the y-axis, then the x-intercept would be the position of the object at the time equal to zero, which usually doesn't exist because time cannot be negative.
Based on this understanding, let's consider the original question which asks for the x-intercept in a context involving distance and time. The correct answer should link the x-intercept with the associated zero value on the y-axis. If we're assuming 'x' represents time and 'y' represents distance from the bus stop, then the intercept should reflect the time it takes to reach the bus stop (where the distance is zero).
So, the x-intercept is:
(27, 0), the time it takes to reach the bus stop