Test review for finding average speed and average velocity

For each of the following cases, find average speed and average velocity
1. An object moves 20mto the left, then 50m to the right then again 100m left. The trip took 20s.

answers: Average speed: 8.5m/s Average velocity:3.5m/s to the left

Average Speed = 170/20 = 8.5m/s
Average Velocity = 70/20 = 3.5m/s left

2. An object moves west 40m, back east 5m , then north 15m. Trip took 2.5 minutes.
Answers: Average speed: 0.4m/s Average velocity: 0.25m/s at 23.2⁰ off the west. )

Average Speed = 60/2.5 = 24meters/minute = 0.4m/s
Average Velocity = 38.1/2.5 = 0.25m/s NW 23.2 degrees