Question

A car passes a landmark on a highway traveling at a constant rate of 40 kilometers per hour. Two hours later, a second car passes the same landmark traveling in the same direction at 65 kilometers per hour. How much time after the second car passes the landmark will it overtake the first car?

Answer 1

 65 - 40 = 25 kilometers per hour which means that then every hour, car 2 gains 25 kilometers so take 80 kilometers divided by 25 kilometers per hour =3.2 hours :) 

Answer 2

I believe it is four hours?