Car a travels 100 kilometers in 2 hours and car B 120 kilometers in 2 hours. The ratio of distance to time of car a is {}, the speed ratio of car a and car B is [} and the distance ratio of car a and car B is {} Car B 3:00^^^^^

Car a travels 100 kilometers in 2 hours and car B 120 kilometers in 2 hours. The ratio of distance to time of car a is {}, the speed ratio of car a and car B is [} and the distance ratio of car a and car B is {} Car B 3:00^^^^^

The ratio of distance and time: 50:1 (100:2);
Speed ratio of a and B: 5:4 (50:40);
Distance ratio of a and B: 5:6 (100:120)

Car a and car B start from Shanghai at the same time and drive to Beijing along the Beijing Shanghai expressway. Car a travels 120 kilometers per hour, and car B travels 85 kilometers per hour

A passenger train from Beijing to Nanjing, 180 kilometers per hour, while a train from Nanjing to Beijing, 120 kilometers per hour, after three hours, two cars are 200 kilometers apart. How long is the railway from Beijing to Nanjing?

（180+120）×3+200