Question

A toy car moves 8 m in 4 s at the constant velocity. whats the car's velocity?

Answer 1

Velocity is calculated by distance and time

v = d/t
v = 8m/4s
v = 2 m/s

It's velocity is 2 meters per second 

Answer 2

Speed  =  (distance covered) / (time to cover the distance)

           =        (8 m)            /          (4 s)

           =         ( 8 / 4 )  m/s

           =             2 m/s   .  

That 's the toy car's speed.  We can't tell its velocity,
since we have no information about its direction.