A truck enters a highway driving 60mph. A car neters the highway at the same place 5 minutes later and drives 72 mph in the same direction. From the time the car enters the highway, how long will it take the car to pass the truck

Let x be the number of hours take the car to pass the truck.

In x hours car can travel x*72 miles.

(In x+5/60) =x+1/12 H truck can travel (x+1/2)*60 =6x+30.

Equating both distances.

60x+30=72x.

30=72x-60.

12x=30.

x=30/12

=2.5 = 2 H 30 minutes.

After 2 H 30 minutes the car enters the highway it recahes the truck.