2. Two bosses, Party A and Party B, bought a piece of fashion at the same price, and Party B bought more sets than Party A 1/5, and then Party A and Party B sold them at profit margins of 80% and 50% respectively. After both of them were sold out, Party A still made more profits than Party B, just enough for him to buy 10 this fashion, which was originally bought by Party A..
3. There are two water pipes A and B, and water is injected into two pools with the same size at the same time. At the same time, the water injection ratio of A and B is 7: 5. After 2+ 1/3 hours, the sum of the water injected into A and B is just a pool. At this time, the water injection rate of pipe A is increased by 25%, while the water injection rate of pipe B is unchanged.
5. Two cars, A and B, set out from two places 750 kilometers apart at the same time, face to face and met for 5 hours. Car A travels 80 kilometers per hour, and how many kilometers does car B travel per hour?
6. Two cars, Party A and Party B, leave from two places 255 kilometers apart at the same time. Car A travels 52 kilometers per hour and car B travels 57 kilometers per hour. A few hours later, the distance between the two cars is still 37 kilometers.
7. Two cleaning vehicles, A and B, perform road cleaning tasks between things. It takes 10 hour for car A to be cleaned alone, and 15 hour for car B to be cleaned alone. Two cars leave from east and west at the same time. When they met, car A was cleaner than car B12km. How many kilometers is it between East and West?