A private airplane leaves Midway Airport and flies due east

A private airplane leaves Midway Airport and flies due east at a speed of 180 km/h. Two hours later, a jet leaves Midway and flies due east at a speed of 900 km/h. How far from the airport will the jet overtake the private plane?

Solution

Let say the distance is x km

time = distance / speed

x/180 = x/900 + 2

or, 4x/900 = 2

or, x = 450km (ans)