Achilles run to the finish point, not to the tortoise's
position.
Calculating distance over speed = time.
Speed of a 100m sprinter is 10m/s
Speed of a tortoise 0.133m/s
Time for achilles to finish race 100/10 = 10s
Time for tortoise to finish race 90/0.133=676.69s
if it is not a race, but chasing the tortoise, sure the gap will
minimize until approximately zero. Then Achilles reach out his
hands.