when will the average velocity be equal to instantaneous velocity?

average velocity = instantaneous
velocity

when the acceleration =
0

if the car is speeding up or down, its instantaneous
velocity changes. The average velocity is always one number. The conclusion that the
instantaneous velocity must be the same throughout. If the instantaneous velocity is
same throughout, than there is no acceleration , which means no change in speed AND
direction. (Remember velocity is a vector, not scalar)