The left panel shows the distribution of trip durations. For annual members, the most common ride length is around 5 minutes, while short term users' rides are two to three times longer. Annual members appear to be very savvy about the 30-minute free ride limit, with only a small number of their trips surpassing this and being subject to additional fees. Short-term users, on the other hand, either don't mind the extra cost of longer rides, or don't understand the intended use of the system, and frequently go longer than the 30 minute free limit. My hunch is that these short-term users aren't fully aware of this pricing structure ("I paid for the day, right?") and likely walk away unhappy with the experience. If I were advising Pronto, I'd recommend they do more to make sure day-pass users understand the pricing structure!

The right panel shows the distribution of lower-bound speed estimates. There is a spike at speed zero for both sets of users, indicating rides that start and stop at or near the same location. This is much more prevalent for short-term users, and probably indicates visitors using bikes to explore a neighborhood rather than to get from point A to point B. Beyond this, the distributions for annual and short-term users are quite different, with annual riders showing on average a higher estimated speed. You might be tempted to conclude here that annual members ride faster than day-pass users, but the data alone aren't sufficient to support this conclusion. This trend could also be explained if annual users tend to go from point A to point B by the most direct route, while day pass users tend to meander around and get to their destination indirectly. I suspect that the reality is some mix of these two effects.

We can see another interesting view of these data by plotting the speed and distance against each other: