motion physics

Coastal roads have lots of curves, thus on the way to Cleopatra’s, Mark drives half the distance at 40 kph and half the distance at 60 kph. On the return trip, he drives half the time at 40 kph and half the time at 60 kph
.a. What is Mark’s average speed on the way to Cleopatra’s house?
b. What is Mark’s average speed on the return trip?
c. What is Mark’s average velocity over the complete round trip?