Final answer:
When two graphs intersect, it indicates that the values they represent are equal at that point, hence the speed of spacecraft A is equal to the speed of spacecraft B at the intersection.
Step-by-step explanation:
At the point where the two graphs of spacecraft A and B cross, their respective speeds will be same. This is because the point of intersection on a graph typically represents a point where the values being plotted, such as speed or distance, are equal for both entities being compared. Even without a specific graph or additional context, we can infer this principle of graph interpretation.