Uniform circular motion

Q. A runner completes one round of a circular track of diameter 400 m in 40 s. What will be the distance covered and the displacement respectively at the end of 2 minutes 20 s?

1. 4400 m, 200 m

2. 2200 m, 400 m

3. 2200 m, 800 m

4. 4400 m, 400 m

Q.

Can a body has a constant speed and still have varying velocity? if yes, give example.