To answer this question, you need to convert the km/hour unit into m/s2 so it can be divided by the train acceleration rate. The calculation would be: 80 km/hour * 1000m/km * 1hour/3600second= 22.22m/s.
If the initial speed is zero, then the time needed for the train to reach that speed is: (22.22m/s) /(1.35m/s2)= 16.46 second
