Nice, I don't see the question . But I'll assume you want to work out how many revolutions the disk does before the ant reaches the edge of the disc, so I'll work that out.
1 cm/s = 0.01 m/s
s = vt
where s is the distance travelled, v is the speed, and t is the time elapsed.
rearrange for t:
t = s/v
t = 1/0.01
t = 100s (time it takes for ant to reach edge)
1 rev/s • 100 = 100 revolutions, that is the answer.