A and B trains leave from two stations at the same time and meet each other in 18 hours. If a train takes 45 hours to travel between the two stations, B train needs to travel less distance between the two stations

30 hours
A takes 2 / 5 of the journey in 18 hours, B takes 3 / 5 in 18 hours, so B takes 30 hours

The distance between a and B is 546 kilometers. A and B cars leave each other and meet each other in three hours,

Suppose the speed of car B is x km / h, then the speed of car a is 3x km / h
3(3x+x）=546
The solution is x = 45.5
3x=3*45.5=136.5
A: car a travels 136.5 kilometers per hour. Car B travels 45.5 kilometers per hour

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