Show that the average speed of a rabbit that runs a distance

Question

of 30 m in a time of 2 s is 15 m/s.

I have a whole bunch of problems such as these and i'm not sure what math formula to use to figure problem.I know its Acceleration !
change of velocity
time interval
!
"v
"t
but how do I work it out

Answer 1

average speed = distance / time

= 30 m / 2 s

= 15 m/s

Answer 2

acceleration is another matter entirely
It is CHANGE in velocity / time