Question

Вдоль беговой дорожки на одинаковом расстоянии стоят столбы. Старт дан у первого столба. Спортсмен бежал с постоянной скоростью и через 12 минут был возле четвертого столба. Через сколько минут после старта бегун будет на финише, который находится у седьмого столба?

Answer 1

Я думаю так :
1)12:4=3(мин) - требуется чтобы пробежать мимо одного столба
2)7-4=3(с)-осталось пробежать столбов
3)3*3=9(мин)-потребуется минут

Answer 2

Problem Analysis

We are given that a runner starts at the first pole and runs along a track with poles evenly spaced. After 12 minutes, the runner reaches the fourth pole. We need to determine how many minutes it will take for the runner to reach the finish line, which is located at the seventh pole.

Solution

To solve this problem, we need to determine the time it takes for the runner to cover the distance between the fourth and seventh poles. Since the poles are evenly spaced, we can assume that the distance between each pole is the same.

Let's assume that the distance between each pole is d. After 12 minutes, the runner reaches the fourth pole, which means the runner has covered a distance of 3d.

To find the time it takes for the runner to cover the distance between the fourth and seventh poles, we can set up a proportion:

12 minutes / 3d = x minutes / 6d

Simplifying the proportion, we get:

12 / 3 = x / 6

Cross-multiplying, we get:

12 * 6 = 3 * x

Simplifying further, we get:

72 = 3x

Dividing both sides by 3, we get:

x = 24

Therefore, it will take the runner 24 minutes to reach the finish line, which is located at the seventh pole.

Answer

The runner will reach the finish line, which is located at the seventh pole, after 24 minutes.