A car moving in a straight line starts at x = 0 at t = 0. It

Question:

A car moving in a straight line starts at x = 0 at t = 0. It passes the point x = 25.0 m with a speed of 11.0 m / s at t = 3.00 s. it passes the point x = 385 m with a speed of 45.0 m/s at t = 20.0 s. Find
(a) The average velocity,
(b) The average acceleration, between T = 3.00s and t = 20.0s.