Question

5. Для посадки 600 плодовых деревьев поставили три бригады: первая берётся посадить за 40 дней, вторая за 24 дня и третья за 60 дней. Во сколько дней, работая вместе, они могут выполнить эту посадку? помогите пожалуйста, СРОЧНО!!​

Answer 1

Ответ:

1) 600:10=60 (дер) - за один день первая бригада
2) 600:15=40 (дер) - за один день вторая бригада

3) 60+40=100 (дер.) - посадят обе бригады 

4) 600:100=6 (дн.)

Ответ: за 6 дней могут посадить эти деревья две бригады работая вместе.

Answer 2

Calculating the Combined Time for Planting 600 Fruit Trees

To calculate the combined time for planting 600 fruit trees by three different teams, we can use the concept of "work done by each team in a unit of time." Let's denote the time taken by the first, second, and third teams as T1, T2, and T3 respectively. The work done by each team in a unit of time can be represented as 1/T1, 1/T2, and 1/T3 respectively.

The combined time for planting 600 fruit trees can be calculated using the formula: Combined Time = 1 / (1/T1 + 1/T2 + 1/T3)

Calculation

Given: - Time taken by the first team (T1) = 40 days - Time taken by the second team (T2) = 24 days - Time taken by the third team (T3) = 60 days

Using the formula: Combined Time = 1 / (1/40 + 1/24 + 1/60)

Calculating the combined time: Combined Time = 1 / (0.025 + 0.0417 + 0.0167) Combined Time = 1 / 0.0834 Combined Time ≈ 12 days

Therefore, working together, the three teams can complete the planting of 600 fruit trees in approximately 12 days.

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