1. The problem statement, all variables and given/known data A train moving at a constant speed of 100km/h travels east for 40min, then 30o east of north for 20 min, and finally west for 30min. What is the train's average velocity for the trip? 2. Relevant equations 3. The attempt at a solution I think I have to calculate displacement from the given velocities, using vector components for 100km/h [30o E of N]. Then I find the total x displacement and total y displacement and divide by time (1.5h) to find the x and y velocities. I'm not sure what to do after this :S.