Question

В 9:00 утра два поезда выехали из двух городов навстречу друг другу в 11:00 утра до встречи им осталось проехать 420 км Найди скорость движения одного поезда если скорость поезда была 100 км ч а расстояние между городами 780 км

Answer 1

11-9 =2 (часа) - время в пути каждого поезда.
780 - 420 = 360 (км) - проехали два поезда.
100·2 = 200 (км)  -проехал первый поезд.
360 - 200 = 160 (км)- проехал второй поезд.
180 : 2 =80 (км/ч) - скорость второго поезда.

Answer 2

Problem Analysis

We are given that two trains started from two cities towards each other at 9:00 AM. At 11:00 AM, they had 420 km left to meet, and the distance between the cities is 780 km. We need to find the speed of one of the trains, given that the speed of one train is 100 km/h.

Solution

To find the speed of one of the trains, we can use the formula:

Speed = Distance / Time

Let's calculate the time it took for the trains to cover the remaining 420 km distance.

The total distance between the two cities is 780 km. At 11:00 AM, the trains had 420 km left to meet. Therefore, the distance covered by both trains at that time is 780 km - 420 km = 360 km.

We know that the time taken by both trains to cover this distance is 2 hours (from 9:00 AM to 11:00 AM).

Now, we can calculate the speed of one of the trains:

Speed = Distance / Time = 360 km / 2 hours = 180 km/h

Therefore, the speed of one of the trains is 180 km/h.

Conclusion

The speed of one of the trains is 180 km/h.

Note: The sources provided by You.com did not contain relevant information for this specific problem. Therefore, the solution provided above is based on mathematical calculations and does not require external sources.