Question

Одна бригада рабочих может заасфальтировать 18км дороги за 30 дней а другая в 2 раза дольше времени за сколько дней смогут заасфальтировать эту дорогу обе бригады работая вместе?

Answer 1

30*2=60 (д) асфальтирует дорогу 2 бригада
18÷30=0.6(км) асфальтирует 1 бригада в день
18÷60=0.3(км) асфальтирует 2 бригада за день
0.6+0.3=0.9(км) асфальтируют обе бригады за день
18:0.9=20(дн)

ответ: за 20 дней заасфальтируют эту дорогу обе бригады

Answer 2

Calculation of Time Required to Asphalt the Road

To calculate the time required for both brigades to asphalt the road together, we need to determine the rate at which each brigade works.

According to the information provided, one brigade of workers can asphalt 18 km of road in 30 days, while the other brigade takes twice as long.

Let's calculate the rate at which each brigade works:

- Brigade 1: 18 km / 30 days = 0.6 km/day - Brigade 2: 18 km / (2 * 30 days) = 0.3 km/day

Now that we know the rate at which each brigade works, we can calculate the time required for both brigades to asphalt the road together.

Calculation:

To calculate the time required for both brigades to asphalt the road together, we need to add up their rates of work.

- Combined rate: 0.6 km/day + 0.3 km/day = 0.9 km/day

Now, we can calculate the time required to asphalt the entire road by dividing the total distance of the road by the combined rate of the two brigades.

- Total distance of the road: 18 km

- Time required: 18 km / 0.9 km/day = 20 days

Therefore, both brigades working together will be able to asphalt the entire road in 20 days.