A truck travels 3.02 km north and then makes a 90.0 left turn and drives another 4.30

Question:

A truck travels 3.02 km north and then makes a 90.0° left turn and drives another 4.30 km. The whole trip takes 5.00 min.
a) With respect to a two-dimensional coordinate system on the surface of Earth such that the y-axis points north, what is the net displacement vector of the truck for this trip?
b) What is the magnitude of the average velocity for this trip?