A motorist drives south at 20.0 m/s for 3.00 min, then turns west and travels at 25.0

Question:

A motorist drives south at 20.0 m/s for 3.00 min, then turns west and travels at 25.0 m/s for 2.00 min, and finally travels northwest at 30.0 m/s for 1.00 min. For this 6.00-min trip, find
(a) The total vector displacement,
(b) The average speed, and
(c) The average velocity. Let the positive x axis point east.