1. The distance between a and B is 196 km. Two cars of a and B drive from the two places at the same time and meet in 7 / 3 hours. What is the speed ratio of a and B It's 4:3. How many kilometers per hour does a and B run? also: 2. There are 1600 machine parts, and it is planned that 5 workers will finish the processing in 4 hours. Due to the need of work, another 3 workers will be transferred when the work starts. How many more hours will it take to complete all the tasks? 3. Only answer with proportion 1. Guangming Road Primary School has 525 students in grade 4, 45 less than that of grade 6 2. Xiao Hong read a story book 25 times a day. After 4 days, she still left 1 / 5 of the book. How many books are there? 3. The distance between station a and station B is 275 km. The two passenger and freight trains start from the two places at 8:00 and run opposite each other. They meet at 10:30. The bus runs 60 km per hour, and the truck runs how many km per hour? 4. A train from Shanghai to Tianjin takes three fifths of the whole journey. If you don't have 106 kilometers per hour, you can get to Tianjin in five hours. How long is the railway from Shanghai to Tianjin?

1. The distance between a and B is 196 km. Two cars of a and B drive from the two places at the same time and meet in 7 / 3 hours. What is the speed ratio of a and B It's 4:3. How many kilometers per hour does a and B run? also: 2. There are 1600 machine parts, and it is planned that 5 workers will finish the processing in 4 hours. Due to the need of work, another 3 workers will be transferred when the work starts. How many more hours will it take to complete all the tasks? 3. Only answer with proportion 1. Guangming Road Primary School has 525 students in grade 4, 45 less than that of grade 6 2. Xiao Hong read a story book 25 times a day. After 4 days, she still left 1 / 5 of the book. How many books are there? 3. The distance between station a and station B is 275 km. The two passenger and freight trains start from the two places at 8:00 and run opposite each other. They meet at 10:30. The bus runs 60 km per hour, and the truck runs how many km per hour? 4. A train from Shanghai to Tianjin takes three fifths of the whole journey. If you don't have 106 kilometers per hour, you can get to Tianjin in five hours. How long is the railway from Shanghai to Tianjin?

1. The sum of speed per hour of a and B is: 196 △ 7 / 3 = 84km; a: 84 △ 4 + 3) × 4 = 48km; B: 84-48 = 36km; 2. Per person per hour: 1600 △ 5 × 4 = 80; need to increase: 1600 △ 80 × (5-3)] - 4 = 6h; 1. The sixth grade has: (525 + 45) △ 3 = 190 people; 2

The distance between the two places is 300 km. After two cars drive from the two places at the same time for 2.5 hours, the distance between the two cars is still 50 km
It is known that one car travels 45 kilometers per hour. How many kilometers does another car travel per hour?

Speed sum = (300-50) △ 2.5 = 100 km / h
Speed of the other car = 100-45 = 55 km / h