Final answer:
The width of each small box on the horizontal axis is 0.02 second.
Step-by-step explanation:
The width of each small box on the horizontal axis is 0.02 second. This can be determined by analyzing the given information and using the tick marks on the graph. Each tick mark represents a unit of time, and in this case, it represents 0.1 second. The rectangle in question is past the second tick mark but not the third, which means it is at least 0.2 second wide. Since there are no markings in between, we can estimate the next place to be 0.05 second, resulting in a width of 0.05 + 0.20 = 0.25 second.