The railway between Party A and Party B is 390 meters long. Two trains run from each other at the same time. The express train runs 80 kilometers per hour, and the local train runs 50 kilometers per hour Come on, before 3:30 on May 2. During this time, the respondents will pay ten more

The railway between Party A and Party B is 390 meters long. Two trains run from each other at the same time. The express train runs 80 kilometers per hour, and the local train runs 50 kilometers per hour Come on, before 3:30 on May 2. During this time, the respondents will pay ten more

The railway between Party A and Party B is 390 meters long. The two trains run from each other at the same time. The express train runs 80 kilometers per hour and the local train 50 kilometers per hour. How many hours after the two trains leave, do they meet?
390÷（80 +50）
=390÷130
=3 (hours)

(1) There are two trains running from a and B at the same time. The local train runs 60 kilometers per hour, and the express train runs one-third and four times more than the local train
How many kilometers is the distance between the two places? If you draw it on the 1:10000000 railway diagram, how many centimeters is the distance between the two places?

Express 60x (1 + 1 / 3) = 80km / h
The distance between the two places is (60 + 80) X4 = 560km
560km = 56000000cm
56000000 △ 10000000 = 5.6CM apart
If you don't understand this question, you can ask,

The distance between a and B is 658 km. The two trains leave from two stations at the same time. They can meet each other in 10 hours. The express train runs 50 km per hour and the local train runs 50 km per hour
The distance between a and B is 658 kilometers. The two trains leave from two stations at the same time, and they can meet each other in 10 hours. How many kilometers does the express train travel per hour and the local train travel per hour?

658 △ 10-50 = 15.8km

Two trains a and B leave from two places at the same time. After five hours, they meet at a distance of 30 kilometers from the midpoint. The speed of the express train is 80 kilometers per hour, and the speed of the local train is 80 kilometers per hour?
Solve the equation and write the process

Set the idle speed to X
5(80-x)=30×2
80-x=12
x=68
A: the local speed is 68 km / h
That is, more than 5 hours: 30 × 2 = 60 km
therefore
One hour express train has more lines than local train: 60 △ 5 = 12 km
therefore
Slow speed: 80-12 = 68 km / h