The express train and the local train run from the two places 1200 kilometers apart at the same time. The express train runs 65 kilometers per hour, and the local train runs 45 kilometers per hour. How many hours The distance between the last two cars is 430km?

The express train and the local train run from the two places 1200 kilometers apart at the same time. The express train runs 65 kilometers per hour, and the local train runs 45 kilometers per hour. How many hours The distance between the last two cars is 430km?

(1200-430)÷(65+45)
=770÷110
=7 hours
Encounter time = encounter distance △ speed and

The distance between station a and station B is 1200 km. A slow train departs from station a, 80 km per hour, and an express train departs from station a
B station, 120 kilometers per hour, two hours
When the train leaves at the same time, the distance between the two trains is 200 kilometers an hour after departure? (solved by equation)
Why there are two solutions to this problem (1) x = 5. (2x = 7)

Case 1:
Before meeting: (80 + 120) x = 1200-200
x=5
Case 2:
After meeting: (80 + 120) x = 1200 + 200
x=7

A. B is 600 kilometers away from the two places. A local train runs 80 kilometers per hour from a, and an express train runs 120 kilometers per hour from B
If the two trains go in the same direction and the local train is behind the express train, how many hours later will the two trains be 761km apart?

There are two situations: ① from a to B; ② from B to a
① After setting x hours, the two cars are 760 km apart
（120X+600）-80X=760
120X-80X+600=760
40X+600=760
40X=760-600
40X=160
X=4
② After setting y hours, the distance between the two vehicles is 760 km
120X-80X=760+600
40X=820
X=20.5

The distance between the two places is 240 km. A slow train from station a runs at 80 km / h, and an express train from station B runs at 120 km / h
Q: if two trains leave at the same time and travel in the same direction (slow train is behind), how long does it take for the two trains to be 300 km apart?

（300-240）÷（120-80）
=60÷40
=1.5 hours