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A. B is 360 km away from each other, and a and B trains run from a and B at the same time After meeting for 3 hours, the two trains continue to run for 1 hour. At this time, the distance from car B to place a is twice that from car a to place B. how fast can the two trains go
Let the velocities of a and B be x and Y respectively
3（X+Y)=360
3X-Y=2(3Y-X)
The solution is x = 70 km / h, y = 50 km / h
A and B trains start from a and B, which are 480km apart, and run in opposite directions. Car a runs 80km per hour, while car B runs 70km per hour. How many hours later are the two trains 30km apart?
Let the distance between the two cars be 30km after X hours. According to the meaning of the question, (& nbsp; 80 + 70) x = 480-30 or & nbsp; (80 + 70) x = 480 + 30, the solution is: x = 3 or x = 175. Answer: the distance between the two cars is 30km after 3 hours or & nbsp; 175 hours
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