Question 900989
A truck enters the highway going 60 miles per hour. Ten minutes later, a car enters the highway going 70 miles per hour. How long, in minutes, does it take for the car to pass the truck?

The truck goes 60*10/60=10 miles in ten  minutes before the car pursued  it.
The car is gaining on the truck at 10 mph so it will take one hour to gain 10  miles