Question

Два поезда одновременно начали движение в противоположных направлениях.Один двигался со скоростью на 30км/час меньше ,чем другой.На каком расстояние друг от друга поезда будут через 4 часа,если скорость другого поезда 130км/час?

Answer 1

1) 130 - 30 = 100 км/ч скорость первого поезда
2) 100 + 130 = 230 км/ч скорость удаления поездов
3) 230 * 4 = 920 км будет через 4 часа

Answer 2

Problem Analysis

We have two trains moving in opposite directions. The speed of one train is 130 km/h, and the speed of the other train is 30 km/h less than the first train. We need to find the distance between the two trains after 4 hours.

Solution

To find the distance between the two trains after 4 hours, we can use the formula:

Distance = Speed * Time

Let's calculate the distance for each train separately and then find the total distance between them.

Train 1: - Speed: 130 km/h - Time: 4 hours - Distance = 130 km/h * 4 hours = 520 km

Train 2: - Speed: 130 km/h - 30 km/h = 100 km/h (since it is moving 30 km/h slower than the first train) - Time: 4 hours - Distance = 100 km/h * 4 hours = 400 km

Total distance between the two trains after 4 hours = Distance of Train 1 + Distance of Train 2 = 520 km + 400 km = 920 km

Therefore, the two trains will be 920 km apart after 4 hours.

Answer

The two trains will be 920 km apart after 4 hours.