Xiaoqiang took the bus at his home to the railway station. After driving 1 / 3 of the distance, he estimated that he would not be able to catch up with the time when the train arrived. So he got off the bus and took a taxi. The speed doubled. As a result, he arrived 5 minutes earlier than only taking the bus and caught up with the train at the railway station. Given that the average speed of the bus is 40 km / h, how far is it from Xiaoqiang's home to the railway station?

Xiaoqiang took the bus at his home to the railway station. After driving 1 / 3 of the distance, he estimated that he would not be able to catch up with the time when the train arrived. So he got off the bus and took a taxi. The speed doubled. As a result, he arrived 5 minutes earlier than only taking the bus and caught up with the train at the railway station. Given that the average speed of the bus is 40 km / h, how far is it from Xiaoqiang's home to the railway station?

Suppose the remaining distance is x km
x/40-x/(2×40)=5/60
x/80=1/12
x=20/3
20 / 3 ÷ (1-1 / 3) = 10km
A: Xiaoqiang's house is 10 kilometers away from the railway station

Xiaoqiang went to the railway station by bus at his home. After a third of the journey, he estimated that he would not be able to catch the time when the train arrived. So he got off the bus and took a taxi. The speed doubled. As a result, he arrived five minutes earlier by taxi than by bus and arrived at the railway station before the train arrived. The average speed of the bus is known to be 40 km / h, How far is it to xiaodeqiang railway station?

10km
S/10-{[(1/3)S]/40+[(2/3)S]/(40*2)=5/60
By solving the equation, s = 10 (km)

What's the difference between the high-speed train and the express train (speed and car body)

The high-speed railway and EMU trains all use the bottom and front of the harmony EMU. In fact, the high-speed railway is also called high-speed EMU, so it belongs to a branch of EMU. On the bottom of the train, the high-speed railway generally uses crh380, and most of the high-speed railway lines use crh380, such as Beijing Tianjin Intercity, Beijing Shanghai, Huning, Wuguang, Zhengxi, etc, But in many areas, high-speed lines have not been rebuilt, so there is no condition to operate high-speed EMUs on the existing lines. Only other models of CRH can be used, such as the EMUs on the Beijing Guangzhou line, There are also many examples of cross line EMUs of Shenyang Railway Bureau. There are also many models. CRH1, a model jointly developed by Qingdao Sifang and Bombardier, is divided into crh1a (8-group), crh1b (16 group) and crh1e (16 group sleeper car, with ride), with a speed of 250 km / h.crh2, a model jointly developed by Qingdao Sifang and Kawasaki heavy industry, It is divided into crh2a (8 marshalling), crh2b (16 marshalling), CRH2C (8 marshalling) and crh2e (16 marshalling sleeper car, with ride). Abe is 250, and C is 350. Direct and express trains are the second fastest trains after motor cars (even some trains are faster than motor cars on existing lines). General express trains are the third and the most (I guess, there is no actual statistics), The bus stops are basically some large and medium-sized stations. Ordinary slow is the slowest. Generally, it is operated by the Railway Bureau itself, and there are few cross lines. I am not sure about the train bottoms used for direct, express, ordinary fast and ordinary slow. The difference on the ticket is that the high-speed Railway starts with G, the motor train starts with D, the direct line starts with Z, the express line starts with T, the ordinary fast line starts with K, and ordinary slow does not have letters