The distance between two cars moving along the highway, 100 km, the speed of the car is 80 km / h and 60 km / h.

The distance between two cars moving along the highway, 100 km, the speed of the car is 80 km / h and 60 km / h. What is the distance between them in an hour if the cars are going in the same direction.
The problem statement does not describe which of the cars drives first. Therefore, we will consider both options.
Option I. We go first by car at a speed of 80 km / h. Then the car that follows her at a speed of 60 km / h will lag behind. Let’s find this speed of cars moving away from each other:
80 – 60 = 20 (km / h).
That is, the distance between cars will increase by 20 km in 1 hour.
Let’s calculate the distance between cars in an hour:
100 + 20 = 120 (km).
Option II. We go first by car at a speed of 60 km / h. Then the second car drives at 80 km / h and catches up with the first car. Let’s find the speed of convergence of cars:
80 – 60 = 20 (km / h).
This means that the distance between cars will decrease by 20 km in 1 hour.
Let’s find the distance between cars in an hour:
100 – 20 = 80 (km).