Two cars drove out of the two cities at the same time towards each other.

Two cars drove out of the two cities at the same time towards each other. One was traveling at a speed of 90 km / h, the other 10 km / h less. After 3 hours, the distance between them was 40 km. What is the distance between the two cities?

We solve the task of actions with explanations. 1) 90 – 10 = 80 kilometers per hour – the speed of the second car; 2) 90 * 3 = 270 kilometers – the distance traveled by the first car in three hours at a speed of 90 kilometers per hour; 3) 80 * 3 = 240 kilometers – the distance traveled by the second car in three hours at a speed of 80 kilometers per hour; 4) 270 + 240 = 510 kilometers – the distance traveled by two cars together; 5) 510 + 40 = 550 kilometers – the distance between cities.
Answer: 550 kilometers.