Calc based- motion in 2 and 3 dimensions

[di8000]

Homework Statement

A train at a constant 79.0 km/h moves east for 25 min, then in a direction 37.0° east of due north for 18.0 min, and then west for 54.0 min. What are the (a) magnitude (in km/h) and (b) angle (relative to north, with east of north positive and west of north negative) of its average velocity during this trip?

Homework Equations

Apparently I don't know.

The Attempt at a Solution

I really have no idea where to even start.

 

[Hootenanny]

It's always best to start by splitting the motion into perpendicular components, in this case eastward components and northward components.

Please be aware that we will help you solve this problems, but you are expected to make a decent attempt at them yourself. "I don't know where to start" isn't really a decent attempt, you can look at examples in your notes or textbook for example.