Question

Миша вскапывает грядку за 6 минут, Саша за 20 минут, Олег за 30 минут. За сколько минут они вместе вскапают грядку?

Answer 1

Ответ:10 мин

Объяснение:

М. за 1 минуту делает 1/15 часть, Г. - 1/30 часть, вместе 1/15+1/30=1/10.

Вместе всю работу сделают за 1:(1/10)=10 минут.

Answer 2

To find out how long it takes for all three of them to dig the bed together, we can use the concept of their individual rates of digging.

Let's assume the total time it takes for them to dig the bed together is T minutes.

Miша's rate: 1 bed / 6 minutes = 1/6 bed per minute Саша's rate: 1 bed / 20 minutes = 1/20 bed per minute Олег's rate: 1 bed / 30 minutes = 1/30 bed per minute

When they work together, their rates add up: Combined rate = Miша's rate + Саша's rate + Олег's rate Combined rate = 1/6 + 1/20 + 1/30

To add these fractions, we need a common denominator, which is 60:

Combined rate = (10 + 3 + 2) / 60 Combined rate = 15 / 60 Combined rate = 1/4 bed per minute

Now, we know their combined rate is 1/4 bed per minute, which means they will dig one whole bed in 4 minutes.

Therefore, it will take them 4 minutes to dig the bed together.