By having the problem that tripped the light repaired.
wha
4
Over 25s
4
Exactly 16 of them
25s for
Exactly 40 of them
100 meters in 25s (100/25) = 4 meters per second and that is the speed
you can do: 1 200s, 6 50s, and 2 25s. Or you can do 1 200, 2 100s, and 6 25s.
Over 25s
Two because 50/25 = 2