Brief introduction of applied mathematics courseware for sixth grade engineering problems in primary schools published by People's Education Press

1, a project takes 5 days to complete, how much is it completed on average every day? 2, a project, completed every day, a few days to complete the whole project? A section of 14 highway is 30 kilometers long. Team A completed the repair alone on 10, and team B completed the repair alone on 15. How many days does it take for two teams to repair together? 30÷(30÷ 10+30÷ 15) requires joint operation time, and the sum of () work efficiency and the length of a section of highway is 30 kilometers. Team A completed the repair alone on 10, and team B completed the repair alone on 15. How many days does it take for two teams to repair together? A section of highway is 30 kilometers long. Team A completed the repair alone on 10, and team B completed the repair alone on 15. How many days does it take for two teams to repair together? 1, a project 1, a project, Party A will do it for 20 days and Party B will do it for 30 days. If the two teams cooperate, every day is over.