Physics
posted by Mel on .
Runner A is initially 3.4 km west of a flagpole and is running with a constant velocity of 5.2 km/h due east. Runner B is initially 5.6 km east of the flagpole and is running with a constant velocity of 5.0 km/h due west. What will be the distance of the two runners from the flagpole when their paths cross?

just working with the xaxis, or number line, the positions at time t are:
p(A) = 3.4 + 5.2t
p(B) = 5.6  5.0t
when they meet,
3.4+5.2t = 5.65.0t
t = .88
p(A) = 1.18
so, the two runners are about 1.2 km east of the pole