While on a road trip to Canada, you rent a car and discover that the speed limit on the highway is 100km/hr. What is the equivalent in mi/hr?

Suppose you are analyzing the relationship between time and distance given in a table,and there are 4 values for each quantity.you divide distance 2 minus distance 1 by time 2 minus time 1.you then divide distance 4 minus distance 3 by time 4 minus time 3 and get a different answer.what can you say about the relationship?