Question

Первая бригада может выполнить работу за13/3 а вторая на 3/4 медленнее за сколько часов могут выполить работу обе бригады работая вместе

Answer 1

3/13 производительнось 1-й
13/3+3/4=61/12
12/61 производительность 2-й
3/13+12/61=339/793
производительность обеих
1 вся работа
1:339/793=793/339=2 целых 115/339

Answer 2

Calculating the Combined Work Rate of Two Teams

To calculate how long it would take for both teams to complete the work when working together, we can use the concept of combined work rates.

First Brigade's Work Rate: 1 job / (13/3) hours = 3/13 jobs per hour

Second Brigade's Work Rate: 1 job / (3/4) hours = 4/3 jobs per hour

Calculating the Combined Work Rate

To find the combined work rate of both brigades working together, we can simply add their individual work rates.

Combined Work Rate: 3/13 + 4/3 = (9 + 52) / 39 = 61/39 jobs per hour

Calculating the Time to Complete the Work Together

Now, to find the time it would take for both brigades to complete the work together, we can use the combined work rate.

Time for Both Brigades to Complete the Work: 1 job / (61/39) jobs per hour = 39/61 hours

Therefore, both brigades working together can complete the work in approximately 39/61 hours.