FOR OBJECT A:-
Here, distance travelled by object A in each 5 interval time period is 10m, 8m, 10m, 14m, 16m, 18m and 20m which is not uniform.
So, motion of object A is Not uniform.
FOR OBJECT B:-
Here, distance travelled by object B in each 5 minute interval is 12m for all the intervals. So, we can say that motion of object B is uniform.