2. The second image plots the number of trips with the check out times for the bikes in a time-series format. What this does is looks at the trend over the month with respect to time of day. We can see from the image that this trend-line has an almost zero gradient. This shows that even though the number of trips increase overall through the month, they are spread across different times during the week at the end of the month same as they were at the start. 

This insight was particularly interesting as it was not obvious through the preliminary analysis and appeared only while trying out different visualization formats