Question

Из городов Липецк и Москва одновременно навстречу к друг другу вышли 2 поезда и встретились через 4 часа.Расстояние между городами 504 км.Скорость первого поезда 42 км/ч.Чему равна скорость 2 поезда? помогите!

Answer 1

1) 504:4=126(км/ч)-скорость сближения поездов
2) 126-42=84(км/ч)-скорость второго поезда

Answer 2

Problem Analysis

We are given the following information: - Two trains, one from Lipetsk and one from Moscow, start simultaneously towards each other. - They meet after 4 hours. - The distance between the two cities is 504 km. - The speed of the first train is 42 km/h.

We need to find the speed of the second train.

Solution

Let's assume the speed of the second train is x km/h.

The total distance covered by the first train in 4 hours is 42 km/h * 4 hours = 168 km.

Since the two trains are moving towards each other, the total distance covered by both trains is equal to the distance between the two cities, which is 504 km.

Therefore, the distance covered by the second train in 4 hours is 504 km - 168 km = 336 km.

We can now set up the following equation to find the speed of the second train:

Speed of the second train * Time = Distance

x km/h * 4 hours = 336 km

Simplifying the equation, we get:

4x = 336

Dividing both sides of the equation by 4, we find:

x = 84

Therefore, the speed of the second train is 84 km/h.

Answer

The speed of the second train is 84 km/h.