Question

От двух станций, которые находятся на растоянии 652км, вышли одновременно навстречу друг другу два поезда и встретились через 4ч. Скорость одного поезда 85км/ч С какой скоростью шёл другой поезд?

Answer 1

1)652:4=163(км/ч) - скорость сближения поездов

2) 163-85=78(км/ч)

Ответ:скорость второго поезда 78км/ч

Решение выражением:

652:4-85=78(км/ч)

Answer 2

Сначала узнаем сколько км проехал один поезд:

1) 85 * 4 = 340 (км)

Теперь узнаем сколько км проехал другой поезд:

2) 652 - 340 = 312 (км)

А теперь узнаем с какой скоростью шел другой поезд:

3) 312 : 4 = 78 (км/ч)

Ответ: со скоростью 78 км/ч шел другой поезд?

Answer 3

Problem Analysis

We have two trains that start simultaneously from two different stations and travel towards each other. The distance between the stations is 652 km. The trains meet each other after 4 hours. We need to find the speed of the second train.

Solution

Let's assume that the speed of the first train is 85 km/h. We'll use the formula: speed = distance / time to find the speed of the second train.

The distance covered by the first train can be calculated using the formula: distance = speed * time. Since the time is 4 hours and the speed is 85 km/h, the distance covered by the first train is 85 km/h * 4 h = 340 km.

Since the total distance between the two stations is 652 km and the first train has covered 340 km, the remaining distance covered by the second train is 652 km - 340 km = 312 km.

Now, we can use the formula speed = distance / time to find the speed of the second train. The distance is 312 km and the time is 4 hours.

Calculation

Let's calculate the speed of the second train:

speed = distance / time

speed = 312 km / 4 h

speed = 78 km/h

Answer

The second train was traveling at a speed of 78 km/h.

Source:

- 'Essays on the history of railways. The third book. The Great Russian ...' (Snippet not available)