Final answer:
Without the total time taken to travel the 60 m distance, we cannot calculate the object's average speed. The concept of average speed is understood as the total distance traveled divided by the total time taken for the journey.
Step-by-step explanation:
To calculate the average speed of an object as it crosses a certain distance mark, like the 60 m mark, we would need to know the total time taken to travel this distance. Average speed is defined as the total distance traveled divided by the total time it takes to travel that distance. In the absence of this time information, we cannot compute the average speed.
However, by looking at the provided information, we have one reference related to average speed during a trip to the store which might help illustrate the concept. For the example of the 30-minute round trip to the store with a total distance of 6 km, the average speed is calculated as the total distance divided by the total time. In this case, it's 6 km divided by 0.5 hours, resulting in an average speed of 12 km/h.