I think that it is point. A point is very precise
N / 2
400 / 2 = 200
200 / 2 = 100
100 / 2 = 50
50 / 2 = 25
25 / 2 = 12.5
It would take her about 15 seconds
(3,-8)
You move down from those coordinates
X stays the same while it just moves down only Y changes