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 120 kilometers per hour. After a few hours

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 120 kilometers per hour. After a few hours

A few hours later, the two cars are 52.5km apart?
After setting x hours, the distance between the two vehicles is 52.5 km
120x-85x=52.5
35x=52.5
x=1.5
A: 1.5 hours later, the two cars are 52.5 kilometers apart

A and B trains leave from Nanjing and Beijing respectively. Car a is 70km / h, and car B is 80km / h. After 12 hours, the two trains meet. On the map of 1:5000000, what is the distance between Nanjing and Beijing in centimeters
First, convert the numerical scale and draw the line scale,

5000000cm = 50km
Therefore, the line segment scale is 150 km
(70 + 80) * 12 = 1800 km = 180 million cm
180000000 * 1 / 5000000 = 36cm