Answer:
5 units
Explanation:
By looking at the graph of the amusement park, we can see where they are plotted. We can see Trolley Train and Silly Slide are nearby, so we can rule out 25 units, and 7 units. That leaves 5 units, and 3 units. If we look closely at the graph, we can see that they are more than 3 units away, so 5 would be the accurate answer.