A and B trains run from two places 1500 kilometers apart at the same time. Car a runs through the whole journey in 15 hours, and car B runs through the whole journey in 20 hours. They meet each other in a few hours

Solution: let x hours meet
1500/15*x+1500/20*x=1500
We get x = 60 / 7

The distance between a and B is 1000 meters. The express trains finish the whole journey in 10 hours, and the slow trains finish the whole journey in 20 hours. The fast trains and slow trains leave each other from the two places at the same time. They meet each other in a few hours

Fast: 1000 divided by 10 = 100
Slow: 1000 divided by 20 = 50
1000 divided by (50 + 100)

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