Question

Работу по изготовлению мебели для школьного кабинета выполняют две бригады.Первая бригада изготавливает одну парту за 4 часа, а вторая бригада за 6 часов.За какое время две бригады могут изготовить одну парту вместе?

Answer 1

1/4+1/6=5/12 производительность двух бригад.
1÷5/12=12/5=2,4 часа нужно двум бригадам.
Ответ: 2,4 часа.

Answer 2

1/4+1/6=(3+2)/12=5/12 парт в час производительность совместной работы
1: 5/12=12/5=2,4 часа - две бригады смогут изготовить одну парту вместе.

Answer 3

Calculating Time for Two Teams to Make One Desk Together

To calculate the time it takes for both teams to make one desk together, we can use the concept of the combined work rate.

Let's denote: - The work rate of the first team as W1 (in desks per hour) - The work rate of the second team as W2 (in desks per hour) - The combined work rate of both teams as W_combined (in desks per hour)

The formula for the combined work rate is: W_combined = 1 / (1/W1 + 1/W2)

Using the given work rates of the two teams, we can calculate the combined work rate and then find the time it takes for both teams to make one desk together.

Calculation

Given: - Work rate of the first team, W1 = 1 desk / 4 hours - Work rate of the second team, W2 = 1 desk / 6 hours

Using the formula: W_combined = 1 / (1/4 + 1/6)

W_combined = 1 / (3/12 + 2/12) W_combined = 1 / (5/12) W_combined = 12/5 desks per hour

So, the combined work rate of both teams is 12/5 desks per hour.

Now, to find the time it takes for both teams to make one desk together: Time = 1 desk / W_combined Time = 1 / (12/5) Time = 5/12 hours

Therefore, both teams can make one desk together in 5/12 hours.

Answer

Both teams can make one desk together in 5/12 hours.