Question

Девочка и мальчик побежали с двух концов беговой дорожки одновременно навстречу друг другу. Длина беговой дорожки 300 метров. Скорость девочки 4 м/с, а мальчика 6 м/с. Через сколько секунд они встретятся?

Answer 1

1) Найдём скорость сближения мальчика и девочки:
4 + 6 = 10 м/с;
2) найдём время сближения:
300 : 10 = 30 с.

Ответ: Мальчик и девочка встретятся через 30 секунд.

Answer 2

Через 30 секунд
300:(6+4)=30(сек)

Answer 3

Problem Analysis

We are given that a girl and a boy start running towards each other from opposite ends of a 300-meter long track. The girl's speed is 4 m/s, and the boy's speed is 6 m/s. We need to determine how many seconds it will take for them to meet.

Solution

To solve this problem, we can use the formula: time = distance / speed. Since the girl and the boy are running towards each other, their combined speed is the sum of their individual speeds.

Let's calculate the time it takes for them to meet:

1. Calculate the combined speed of the girl and the boy: combined_speed = girl_speed + boy_speed. - Substituting the given values, we have: combined_speed = 4 m/s + 6 m/s = 10 m/s.

2. Calculate the time it takes for them to meet: time = distance / combined_speed. - Substituting the given value for distance, we have: time = 300 m / 10 m/s. - Simplifying, we get: time = 30 seconds.

Therefore, the girl and the boy will meet after 30 seconds.