Question

Два пчеловода собирают весь мёд за 12 мин. Если первый Пчеловод будет собирать мед 1 то он затратит на эту работу 20 минут. Сколько минут нужно второму пчеловодов чтобы собрать весь мед одному? А-20 Б-15 В-30 Г-20 И почему (решение) помогите пожалуйста.

Answer 1

Вот
тоже
20минут нужно второму пчеловодов чтобы собрать весь мед одному

Answer 2

Problem Analysis

We have two beekeepers who can collect all the honey in 12 minutes. If the first beekeeper collects the honey alone, it will take him 20 minutes. We need to find out how many minutes it will take the second beekeeper to collect all the honey alone.

Solution

Let's assume that the second beekeeper can collect all the honey alone in x minutes.

According to the problem, when the first beekeeper collects the honey alone, it takes him 20 minutes. This means that in 1 minute, the first beekeeper collects 1/20th of the honey.

Similarly, when both beekeepers work together, they can collect all the honey in 12 minutes. This means that in 1 minute, both beekeepers together collect 1/12th of the honey.

Now, let's calculate how much honey the second beekeeper can collect in 1 minute. Since the first beekeeper collects 1/20th of the honey in 1 minute, and both beekeepers together collect 1/12th of the honey in 1 minute, the second beekeeper must be collecting the difference between these two amounts.

So, the second beekeeper can collect (1/12 - 1/20) of the honey in 1 minute.

To find out how many minutes it will take the second beekeeper to collect all the honey alone, we can set up the following equation:

(1/12 - 1/20) * x = 1

Simplifying the equation, we get:

(20 - 12) * x = 12 * 20

8 * x = 240

x = 240 / 8

x = 30

Therefore, the second beekeeper will take 30 minutes to collect all the honey alone.

Answer

The correct answer is В-30. The second beekeeper will take 30 minutes to collect all the honey alone.

Explanation

When the first beekeeper collects the honey alone, it takes him 20 minutes. When both beekeepers work together, they can collect all the honey in 12 minutes. By setting up an equation and solving for x, we find that the second beekeeper will take 30 minutes to collect all the honey alone.