Answer:
They both meet after 27 s.
Step-by-step explanation:
Length of track = 400 m
speed of man, v = 8 m/s
speed of woman, v' = 5 m/s
Woman is 50 m ahead of man.
Let the time taken to meet is t.
Let the man covered a distance d in time t o the woman covered a distance 400 - 50- d.

The time taken is

Answer:
3 seconds.
Step-by-step explanation:
f(t) = height of the disc = -18t^2 + 42t + 36.
This equals zero when it completes its path, so:
-18t^2 + 42t + 36 = 0
-6(3t^2 - 7t - 6) = 0
-6 (3t + 2)(t - 3) = 0
t = 3 seconds (We ignore the negative zero).