From city A to city B, the distance between which is 640 km, two trucks drove out simultaneously at speeds

From city A to city B, the distance between which is 640 km, two trucks drove out simultaneously at speeds of 56 km and 60 km per hour. In how many hours will the second car be twice as close to the city as the first?

1. We take the time as x, after which the second car will be twice as close to the city B as the first.
2. The first car during this time will travel 56 km and it will have to go to city B
(640 – 56x) km.
3. The second car will travel 60 km during this time and it will have to go to city B
(640 – 60x) km.
4. Let’s make the equation:
(640 – 56x) / (640 – 60x) = 2;
640 – 56x = 1280 – 120x;
64x = 640;
x = 10 hours.
Answer: After 10 hours, the second car will be twice as close to city B as the first.