PHYS 1301W Lecture 1: Average velocity, instantaneous velocity, acceleration

How do you find the displacement, average acceleration, average velocity, instantaneous velocity and instantaneous acceleration if you're given a velocity vs. time graph?

How do i find the instantaneous average velocity manually from a displacement-time graph?

A motorist drives north for 41.0 minutes at 75.5 km/h and thenstops for 15.0 minutes. He then continues north, traveling 130 kmin 2.10 h.
(a) What is his total displacement?
km

(b) What is his average velocity?
km/h