Question

3. Два поезда вышли одновременно навстречу друг другу из пунктов А и В, расстояние между которыми 520 км. Скорость одного поезда 60 км/час, другого 70 км/час. Какое расстояние будет между поездами через 3 часа после их выхода? б) через 5 часов после их выхода?

Answer 1

1)скорость сближения

60+70= 130 км/час

2)пройдут за 3 часа

130*3= 390 км

3)расстояние между ними через 3 часа

520-390= 130 км

4)пройдут за 5 часов

130*5= 650 км

5)расстояние между ними через 5 часов

650-520= 130 км

Answer 2

1) 60 + 70 = 130 км/ч общая скорость

2) 3 х130 = 390 км расстояние которое  проедут оба поезда через 3 часа

3) 520 - 390 = 130 км расстояние между поездами через 3 часа

4) 5 х 130 = 650 км проедут оба поезда через 5 часов

5) 650 -520 = 130 км расстояние между поездпми через 5 часов(то есть они встретятся и разъедутся)

Answer 3

Problem Analysis

We are given two trains that start simultaneously from points A and B, which are 520 km apart. The first train has a speed of 60 km/h, and the second train has a speed of 70 km/h. We need to find the distance between the trains after 3 hours and after 5 hours.

Solution

To find the distance between the trains after a certain time, we can use the formula:

distance = speed × time

Let's calculate the distance between the trains after 3 hours and after 5 hours.

Calculation

1. Distance between the trains after 3 hours: - The first train travels at a speed of 60 km/h for 3 hours, covering a distance of 60 km/h × 3 h = 180 km. - The second train travels at a speed of 70 km/h for 3 hours, covering a distance of 70 km/h × 3 h = 210 km. - The total distance between the trains after 3 hours is 180 km + 210 km = 390 km.

2. Distance between the trains after 5 hours: - The first train travels at a speed of 60 km/h for 5 hours, covering a distance of 60 km/h × 5 h = 300 km. - The second train travels at a speed of 70 km/h for 5 hours, covering a distance of 70 km/h × 5 h = 350 km. - The total distance between the trains after 5 hours is 300 km + 350 km = 650 km.

Therefore, the distance between the trains after 3 hours is 390 km, and the distance between the trains after 5 hours is 650 km.

Answer

The distance between the trains after 3 hours is 390 km, and the distance between the trains after 5 hours is 650 km.