An ordinary plane leaves an airport and flies due west at 180kph. Two hours later a jet leaves the same airport and flies due west at 900kph. How far from the airport will the jet overtake the ordinary plane?

Answer 1

distance traveled is the same
plane1:
d=180*t
Plane2
d=(900)(t-2)
set them equal
180t=900t-1800
solve for time t, then go solve for d in either equation.