If the speed of the bus is 1.5 times that of the truck, then the distance between a and B & nbsp; stations is less than 20 km______ km．

If the speed of the bus is 1.5 times that of the truck, then the distance between a and B & nbsp; stations is less than 20 km______ km．

20 × 2 △ 1.5-1 × (1 + 1.5), = 40 △ 0.5 × 2.5, = 80 × 2.5, = 200 (km). Answer: A, B & nbsp; two stations are 200 km apart

It takes about 15 hours for a train to leave Beijing and arrive in Guangzhou. After the train leaves, it will run at the original speed of 8 hours and then arrive in Wuhan. As the world's highest speed railway Wuhan Guangzhou high speed railway officially put into operation in December 2009, the average speed of the train from Wuhan to Guangzhou is more than 50 kilometers per hour, and the time required is also shortened by 4 hours Average speed from Beijing to Wuhan and average speed from Wuhan to Guangzhou after speed up

Let the average speed of the train from Beijing to Wuhan be x km / h, and the average speed from Wuhan to Guangzhou be y km / h after the speed increase. According to the meaning of the question, y = 2x + 5015x = 8x + (15 − 8 − 4) y solves the equations, and x = 150y = 350. A: the average speed of the train from Beijing to Wuhan is 150 km / h, and the average speed from Wuhan to Guangzhou is 350 km / h after the speed increase

It takes about 15 hours for a train to leave Beijing and arrive in Guangzhou. After the train leaves, it will run at the original speed of 8 hours and then arrive in Wuhan. As the world's highest speed railway Wuhan Guangzhou high speed railway officially put into operation in December 2009, the average speed of the train from Wuhan to Guangzhou is more than 50 kilometers per hour, and the time required is also shortened by 4 hours Average speed from Beijing to Wuhan and average speed from Wuhan to Guangzhou after speed up

Let the average speed of the train from Beijing to Wuhan be x km / h, and the average speed from Wuhan to Guangzhou be y km / h after the speed increase. According to the meaning of the question, y = 2x + 5015x = 8x + (15 − 8 − 4) y solves the equations, and x = 150y = 350. A: the average speed of the train from Beijing to Wuhan is 150 km / h, and the average speed from Wuhan to Guangzhou is 350 km / h after the speed increase