2. Party A and Party B can complete a project in 8 days, and Party B and Party C can complete it in 6 days; The cooperation between Party C and Party D can be completed in 12 days; Then how many days can the cooperation between Party A and Party B be completed?
3. A project will be completed by Party A alone for 20 days and Party B alone for 30 days. If Party A does it for a few days first and then Party B does it, it will take 25 days to finish it. Q: How many days do A and B work respectively?
4. To manufacture a batch of parts, Party A and Party B can cooperate for 8 days, and Party A can finish it alone in 12 days. If Party B moves ahead a few days, Party A will continue to do it, and it will take both parties 15 days to complete all the work.
5. A project can be completed within 30 days after the cooperation between Party A and Party B. 12 days later, the remaining projects will be completed by Party A alone in 24 days. Q: How many days will it take for this project to be completed by Party A and Party B alone?
6. With the cooperation of Party A and Party B, a project can be completed in 12 days; if Party A works in 10 days, Party B will continue to work in 15 days. Q: How many days will it take for Party A and Party B to complete this project alone?
7. It takes 2.4 days for Party A and Party B to complete a project, while it takes 6 days for Otsuichi to complete a project alone. If Party B starts work on the first day and Party A continues to do it on the second day, how many days will it take to complete this project?
8. A project can be completed in 0/2 days for Party A, 0/5 days for Party B and 0/8 days for Party C. Today, Party A starts work on the first day and Party B does it on the second day. On the third day, Party C will do it in Liao's order. How many days will it take to complete?
9. An express train and a local train leave from Station A and bilibili at the same time. /kloc-After 0/2 hour rendezvous, it will take 8 hours for the express train to reach bilibili, and several hours for the local train to reach Station A?
10. A job. A will be finished by B in five hours, and it will be finished in three hours. After B has done it for 9 hours, A can do it and finish it in 3 hours. So how many hours can B do after A does 1 hour?
1 1. Children's Map Give Children Cookies. If only for large classes, each person gets 15 acetylene. If you give it to children in large and small classes, it's 6 yuan each. If it is only given to children in small classes, how much will each person get?
12. There are two water pipes A and B in the water area. Open pipe A for 3 hours and 20 minutes to fill half the pond, and then open pipe B to inject water together. It takes 2 hours 15 minutes to fill the pond. If pipe B can be filled with 13 cubic meters of water every hour, what is the volume of this pool?
13. There are two groups of workers, A and B, who are both working on the same project. If No.9 is completely completed by Group A and No.27 is completely completed by Group B, how many days can this project be completed with the cooperation of Group A and Group B workers?
14. There is a project, 12 is completed by Party A alone, and 18 is completed by Party B alone. If Party A has a day off, how many days will it take to finish?
15. For a project, if Party A works alone for 2 hours, the clock for completing all the work will be completed. If three people cooperate at first, how many hours will it take to complete all the projects?
16. Party A and Party B completed a project in eight days, Party B and Party C 10 and Party A and Party C 12. How many days will it take for Party A, Party B and Party C to complete this project now?
17. When Party A and Party B cooperate on a project, it takes 15 for Party A to stop working for five days, and it can be completed in 12 days if Party A does not stop working. Q: How many days does it take to do this project independently?
18. A job, completed alone, takes 12 days to complete. B takes 15 days to complete, and C takes 20 days to complete. Now Party A and Party B will cooperate for 4 days, and then Party C will participate. Q: How many days does it take C to participate in the project?
19. If a job is completed alone, Party A needs 10 days, Party B needs 15 days, and Party C needs 20 days. Now Party A, Party B and Party C are cooperating, but Party A has to leave halfway and it will take 6 days to complete it. Q: A left after working for a few days?
20. A class of students planted trees, 100 Chinese fir seedlings and poplar seedlings. Each group was divided into 6 Chinese fir seedlings and 8 poplar seedlings. In this way, the Chinese fir seedlings have just been beaten, and there are two poplar seedlings left. How many Chinese fir seedlings and poplar seedlings are there?
2 1. With 8 kilograms of silk, you can weave silk with a width of 6 centimeters with 4 meters. Now silk has 10kg. How many meters can a 7.5 decimeter wide silk weave?