Physics
posted by Dawn .
Two people start at the same place and walk around a circular lake in opposite directions. One walks with an angular speed of 1.10 103 rad/s, while the other has an angular speed of 3.90 103 rad/s. How long will it be before they meet?

d1 + d2 = 2pi,
(1.1*10^3)t + (3.9*10^3)t = 2pi,
5*10^3t = 2pi,
t = 2pi/0.005 = 6.28/0.005 = 1256 s =
20.9 min.