A high-speed railway train and a EMU are running from city a to city B. It takes 5 hours for high-speed railway and 7.5 hours for EMU. It is known that the speed of high-speed railway train is higher than that of EMU The speed of high-speed train and the distance between a and B should be calculated

A high-speed railway train and a EMU are running from city a to city B. It takes 5 hours for high-speed railway and 7.5 hours for EMU. It is known that the speed of high-speed railway train is higher than that of EMU The speed of high-speed train and the distance between a and B should be calculated

If the distance is set at x km, there will be;
x/5=2(x/7.5)-100;
3x=4x-1500;
x=1500;
So the distance is 1500 kilometers

Next to the railway line, there is a road along the direction of the railway. A tractor driver on the road saw an oncoming train passing from the front to the rear
It took 15 seconds for him to walk beside him. It is known that the speed of the train is 60 kilometers per hour, the total length is 345 meters, and the speed of the tractor is fast

Converted train speed: M / S
60000 M / 3600 s = 16.7 M / S
Setting: the distance of the tractor is x m, the speed of the tractor is Y M / s,
Equation: (345-x) / 15 = 16.7
X/Y=15
Y = 6.3 m / S
Conversion, 6.3 * 3600 / 1000 = 22.68
The speed of the tractor is 22.68 km / h
Ha, I haven't worked out the math problem for many years. I don't know if it's right. Ha ha, I'm bored. I'm playing with it!

There is a road beside the railway. On the road, a train runs at 20 km / h. at this time, a train runs at 56 km / h. It takes 37 seconds for the locomotive to pass by the end of the train
Write specific steps, I will add points

20 km / h = 50 / 9 m / S
56 km / h = 140 / 9 m / S
Conductor = (140 / 9-50 / 9) * 37 = 370m