Question

Двое очистили 450 картофелин: первый очищал три катрофелины в минуту ,второй две .второй работал на 25 минут больше первого . сколько времени работалкаждый ?

Answer 1

25*2=50 карт
450-50=400 карт
400/(3+2)=80 мин=1ч20мин работал первый
1ч20мин+25мин=1ч45мин

Answer 2

Problem Analysis

Two people have cleaned 450 potatoes. The first person cleans 3 potatoes per minute, while the second person cleans 2 potatoes per minute. The second person worked 25 minutes longer than the first person. We need to determine how long each person worked.

Solution

Let's assume that the first person worked for x minutes. Since the second person worked 25 minutes longer, the second person worked for (x + 25) minutes.

The total number of potatoes cleaned by the first person can be calculated by multiplying the number of potatoes cleaned per minute (3) by the number of minutes worked (x):

Potatoes cleaned by the first person = 3x

Similarly, the total number of potatoes cleaned by the second person can be calculated by multiplying the number of potatoes cleaned per minute (2) by the number of minutes worked (x + 25):

Potatoes cleaned by the second person = 2(x + 25)

According to the problem, the sum of the potatoes cleaned by both people is 450:

3x + 2(x + 25) = 450

Simplifying the equation:

3x + 2x + 50 = 450 5x + 50 = 450 5x = 400 x = 80

Therefore, the first person worked for 80 minutes, and the second person worked for (80 + 25) = 105 minutes.

Answer

The first person worked for 80 minutes, and the second person worked for 105 minutes.