Question

Помогите пожалуйста!Два пешехода вышли навстречу друг другу.Скорость одного из них 3,8 км/ч, а другого на 0,4 км/ч больше.Через 0,5 ч они встретились.Какое расстояние было между ними в начале пути?

Answer 1

1) 3,8+0,4 = 4,2 (км/ч)- скорость второго пешехода.

2) 3,8*0,5 = 1,9 (км) - прошёл первый.

3) 4,2*0,5 = 2,1 (км)- прошёл второй.

4) 2,1+1,9 = 4 (км) - расстояние.

Ответ: 4 км расстояние было между ними. 

Answer 2

Problem Analysis

We are given the speeds of two pedestrians who are walking towards each other. One pedestrian has a speed of 3.8 km/h, while the other has a speed that is 0.4 km/h faster. They meet after 0.5 hours. We need to find the initial distance between them.

Solution

Let's assume the initial distance between the pedestrians is x km.

The first pedestrian's speed is 3.8 km/h, so in 0.5 hours, they would have covered a distance of 3.8 * 0.5 = 1.9 km.

The second pedestrian's speed is 0.4 km/h faster, so their speed is 3.8 + 0.4 = 4.2 km/h. In 0.5 hours, they would have covered a distance of 4.2 * 0.5 = 2.1 km.

Since they meet after 0.5 hours, the total distance covered by both pedestrians is 1.9 + 2.1 = 4 km.

Therefore, the initial distance between them was 4 km.

Answer

The initial distance between the two pedestrians was 4 km.