Question

Первая бригада может отремонтировать 180м дороги за 6 дней,а вторая за 3 дня. За сколько дней можно отремонтировать эту дорогу,если обе бригады будут работать вместе?

Answer 1

1)180÷6=30(м/дн)
2)180÷3=60(м/дн)
3)60+30=90(м/дн)
4)180÷90=2(дн)
Ответ:за два дня можно отремонтировать дорогу.

Answer 2

Calculation of Road Repair Time

To calculate the time it would take for both the first and second brigades to repair the road together, we need to determine their combined efficiency.

According to the information provided, the first brigade can repair 180 meters of road in 6 days, while the second brigade can repair the same length of road in 3 days.

To find the combined efficiency, we can calculate the rate at which each brigade repairs the road.

The first brigade repairs 180 meters in 6 days, which means they repair at a rate of 30 meters per day.

The second brigade repairs 180 meters in 3 days, which means they repair at a rate of 60 meters per day.

To find the combined rate, we add the rates of both brigades: 30 meters per day + 60 meters per day = 90 meters per day.

Now, we can calculate the time it would take for both brigades to repair the entire road together.

Since the combined rate is 90 meters per day, and the total length of the road is 180 meters, we divide the total length by the combined rate: 180 meters / 90 meters per day = 2 days.

Therefore, if both brigades work together, they can repair the entire road in 2 days.