According to the fact that the number of days for Team A to lay 350m is the same as that for Team B to lay 250m, it can be concluded that
350/x=250/(x-20), that is, 350x-7000=250x. If the equation is solved, x=70.
In other words, Team A can dig 70 meters every day, while Team B can dig 70-20=50 meters every day.
2. If the project is completed within 10 days, at least1000/10 =100 meters should be dug every day. Therefore, it can be designed as follows
Two engineering teams, Party A and Party B, start the construction from both ends of the pipeline and dig in the middle, so that120m can be dug every day, which can ensure the timely completion.
Or, Party A and Party B can dig 960 meters in 8 days at the same time, and the final project can be completed by Team A or Team B. ..
By analogy, you can ask the A or B engineering team to start work for one day and then start work at the same time.
I thought of these plans, and it is estimated that there will be ... hehe.