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Write some math application problems in grade four, five and six of A and B elementary schools.
1. Party A, Party B and Party C plant trees in two plots A and B respectively, with 900 trees in plot A and 0/250 trees in plot B. It is known that Party A, Party B and Party C can plant 24, 30 and 32 trees every day, of which Party A plants trees in plot B, and Party B plants trees in plot A first and then moves to plot B..

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?