Overview
I'm working on a physics question and need an explanation and answer to help me learn.
I walk down a long street at 1 m/s for an hour. During this time I count the number of trams that pass me by. Knowing that they follow a regular timetable in both directions I am initially surprised to note that only 15 trams overtake me, whereas 20 passed me head-on. What is the average speed of the trams?