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We can say that the average velocity is displacement over total time.

Average velocity = displacement/Total time

V(av) = Δd/Δt

V(av) = (df – di)/(tf – ti)

Where,

Δd = change in distance

Δt = change in time

df = final distance

di = initial distance

tf = final time

ti = initial time

The S.I unit of average velocity is same as velocity, which is m/s.

Initial position = 10 m

Final position = 30 m

Initial time = 4 sec

Final time = 8 sec

Therefore,

Average velocity = (30 – 10)/(8 – 4)

= 20/4 = 5 m/s.

Initial velocity= Vi = 150 m/s

Final velocity = Vf = 250 m/s

Since,

V(av) = (Vi + Vf)/2

= (150 + 250)/2 = 400/2 = 200 m/s.