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Average velocity = Total displacement/total time

V(av) = (xf – xi)/(tf – ti)

V(av) = Δx/Δt

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

Where,

xf = final position

xi = initial position

tf = final time

ti = initial time

Vi = initial velocity

Vf = final velocity

Unit of average velocity is m/s which is same as velocity.

Initial velocity= Vi = 65 m/s

Final velocity = Vf = 85 m/s

Since,

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

= (65 + 85)/2 = 150/2 = 75 m/s.

Initial position = 25 m

Final position = 65 m

Initial time = 3 sec

Final time = 9 sec

Therefore,

Average velocity = (65 – 25)/(9 – 3)

= 40/6 = 6.67 m/s.