1, workload = working efficiency x working time.

2, working hours = workload ÷ work efficiency.

3. Working hours = total workload ÷ (A working efficiency +B working efficiency).

Related examples:

1, a batch of parts will be completed in 6 hours by Party A and 8 hours by Party B.. Now two people work together to complete the task. A has done 24 more than B. How many parts are there?

Solution: If the total workload is 1, then Party A completes 1/6, Party B completes 1/8, and Party A completes more than Party B (1/6- 1/8), and two people work together to complete/kloc-0. Because it takes (1÷ (1/6+1/8) hours for two people to work together, during this time, A made 24 more parts than B.

2. In a project, Team A and Team B cooperated for 20 days, and after 3 days, Team A has worked for 2 days. * * * Same as 1/5 of the whole project. How many days does it take for Team A and Team B to work alone?

Thinking of problem solving: Party A and Party B cooperate every day 1/20. After Party A does it for 3 days, Party B does it for 2 days, that is to say, Party A and Party B do it for 3 days, 2 days ×1/20 =110, 3 days 1/5-. A daily completion110 ÷ 3 =1/30, that is, 30 days, and b daily completion1/20-1/30 =1/60, that is, 60.