Answer:
Considering the lack of information, this is the best I can do.
The average velocity can be calculated via [tex]\frac{V-V_0}{t} = V_{avg}[/tex].
If there is acceleration instead of V or V not given, use the first kinematic equation: [tex]V = V_0 + at[/tex]
Hope it helps :) and provide more complete information and I can answer better