Question

Из двух поселков,расстояние между которыми 81км,вышли одновременно навстречу друг другу два пешехода.Один из них проходил в час 6км,а другой -на 1 км меньше.Какое расстояние будет между ними через 7часов?

Answer 1

Скорость первого пешехода 
6км/ч

Cкорость второго пешехода
6-1 = 5км/ч

Скорость сближения
6+5 = 11 км/ч

За 7 часов расстояние сократилось на
11*7 = 77 км

И стало равным
81-77 = 4км

Answer 2

Problem Analysis

We have two pedestrians walking towards each other from two different villages. The distance between the villages is 81 km. One pedestrian walks at a speed of 6 km/h, while the other walks at a speed 1 km/h slower. We need to find the distance between them after 7 hours.

Solution

To find the distance between the pedestrians after 7 hours, we need to calculate the total distance covered by both pedestrians and subtract it from the initial distance between the villages.

Let's calculate the distance covered by each pedestrian in 7 hours:

- The first pedestrian walks at a speed of 6 km/h, so in 7 hours, they will cover a distance of 6 km/h * 7 h = 42 km. - The second pedestrian walks at a speed 1 km/h slower, which is 6 km/h - 1 km/h = 5 km/h. In 7 hours, they will cover a distance of 5 km/h * 7 h = 35 km.

Now, let's calculate the distance between the pedestrians after 7 hours:

- The initial distance between the villages is 81 km. - The first pedestrian has covered a distance of 42 km. - The second pedestrian has covered a distance of 35 km.

To find the remaining distance between them, we subtract the sum of the distances covered by both pedestrians from the initial distance between the villages:

81 km - (42 km + 35 km) = 81 km - 77 km = 4 km.

Therefore, the distance between the pedestrians after 7 hours will be 4 km.

Answer

The distance between the two pedestrians after 7 hours will be 4 km.