Question

Из городов А и В,расстояние между которыми 250 км,вышли одновременно навстречу друг другу два поезда.Первый шёл со скоростью 60км/ч,второй 40 км/ч.Через сколько часов они встретятся?

Answer 1

1) 60+40=100  км проходят оба поезда за час
2) 250:100=2,5 часа
Ответ Через 2 часа 30 минут поезда встретятся

Answer 2

Problem Analysis

We are given two cities, A and B, which are 250 km apart. Two trains start simultaneously from these cities and travel towards each other. The first train has a speed of 60 km/h, while the second train has a speed of 40 km/h. We need to determine how many hours it will take for the trains to meet.

Solution

To find the time it takes for the trains to meet, we can use the formula:

Time = Distance / Relative Speed

The relative speed of the two trains is the sum of their individual speeds. Let's calculate the time it takes for the trains to meet.

Calculation

The distance between cities A and B is 250 km

The relative speed of the two trains is the sum of their individual speeds: 60 km/h + 40 km/h = 100 km/h.

Using the formula, we can calculate the time it takes for the trains to meet:

Time = Distance / Relative Speed = 250 km / 100 km/h = 2.5 hours

Therefore, the trains will meet after 2.5 hours.

Answer

The two trains will meet after 2.5 hours.