Two cars left at the same time from two cities towards each other from two points.

Two cars left at the same time from two cities towards each other from two points. in how many hours will they meet if the first car travels the entire distance between these points in 30 hours, and the second – 45 hours?

1) What part of the journey does the first car cover in 1 hour if it covers the entire distance between these cities in 30 hours?

1: 30 = 1/30 (part).

2) What part of the journey does the second car cover in 1 hour if it covers the distance between cities in 45 hours?

1:45 = 1/45 (part).

3) What part of the way do both cars pass in 1 hour together?

1/30 + 1/45 = 3/90 + 2/90 = 5/90 = 1/18 (part).

4) In how many hours will the cars meet if they left two cities at the same time towards each other?

1: 1/18 = 18 (hours).

Answer: the cars will meet in 18 hours.