Question

Одна бригада рабочих может заасфальтировать 15км шоссейной дороги за 30 дней а другая за 60дней за сколько дней могут заасфальтировать эту дорогу обе бригады работая вместе (В ТАБЛИЦУ)

Answer 1

Продуктивность 1
15/30= 0.5
продуктивность 2
15/60=0.25
общая
0.5+0.25=0.75
15/0.75=20

Answer 2

Problem Analysis

We have two teams of workers who can each asphalt a certain length of road in a given number of days. We need to determine how many days it will take for both teams to asphalt the road if they work together.

Solution

Let's calculate the rate at which each team asphalts the road and then determine the combined rate when they work together.

Team 1: - Length of road: 15 km - Time taken: 30 days

Team 2: - Length of road: 15 km - Time taken: 60 days

To calculate the rate at which each team asphalts the road, we can divide the length of the road by the time taken:

Team 1's rate: 15 km / 30 days = 0.5 km/day.

Team 2's rate: 15 km / 60 days = 0.25 km/day.

To determine the combined rate when both teams work together, we can add their individual rates:

Combined rate: 0.5 km/day + 0.25 km/day = 0.75 km/day.

Now, we can calculate the number of days it will take for both teams to asphalt the road by dividing the total length of the road by the combined rate:

Total length of road: 15 km.

Number of days required: 15 km / 0.75 km/day = 20 days.

Therefore, it will take both teams working together 20 days to asphalt the road.

Answer

Both teams working together can asphalt the road in 20 days.