I am not completely clear on the specific question here, but it seems to me that using a triple bar graph or line graph would be the easiest thing to do. Although I do not see the need for both distance and speed to be accounted for when it comes to fares charged. If starting at the same location each time, then distance would be easily compared and fares charged for given distances would follow. However, if speed time is the determining factor for fares charged, then I would use it. Or, you could use the transitive property ...if a implies b, and b implies c, then a implies c. You would need to compare 2 at a time and then draw a conclusion.