Graphs in practical situations — practice question

A tram departs from a station, speeds up for 2 minutes until its speed is 12 metres per second, then travels at that speed for 1 minute. After that, it slows down for 3 minutes and comes to rest at the next station. The diagram gives the speed-time graph for this trip. Speed (metres per second) is shown on the vertical axis, while Time (minutes) is shown on the horizontal axis.