Question

Андрей едит на велосипеде и в каждую минуту проезжает 200 м . Сергей едит ему на встречу со скоростью 80 м/мин . Через сколько минут они встретятся если сейчас между ними 840м и 1км400м

Answer 1

200+80=280м/мин скорость сближения
840/280=3 мин они встретятся

1м400м=1400м
1400/280=5мин он встретятся

Answer 2

1)840/(200+80)=3(мин)-840 метров;
2)1400/(200+80)=5(мин)-1400 метров;
Ответ:3,5 минут

Answer 3

Problem Analysis

Andrey and Sergey are riding towards each other on bicycles. Andrey is traveling at a speed of 200 m/min, while Sergey is traveling at a speed of 80 m/min. The initial distance between them is given as 840 m, and the final distance is given as 1,400 m.

We need to determine how many minutes it will take for them to meet.

Solution

To solve this problem, we can use the concept of relative speed. The relative speed is the sum of the speeds of two objects moving towards each other.

Let's calculate the relative speed of Andrey and Sergey: - Andrey's speed: 200 m/min - Sergey's speed: 80 m/min

The relative speed is the sum of their speeds: 200 m/min + 80 m/min = 280 m/min.

Now, we can calculate the time it takes for them to meet by dividing the initial distance between them by the relative speed: - Initial distance: 840 m - Relative speed: 280 m/min

Time = Initial distance / Relative speed = 840 m / 280 m/min = 3 minutes.

Therefore, Andrey and Sergey will meet in 3 minutes.

Answer

Andrey and Sergey will meet in 3 minutes.

Note: The sources provided did not contain specific information related to this problem. The solution is based on the concept of relative speed, which is a fundamental concept in physics and mathematics.