Question

Из двух городов,расстояние между которыми 800км,одновременно навстречу друг другу выехали два поезда и встретились через 5 часов. Скорость первого поезда 75км/ч. С какой скоростью ехал второй поезд? На каком расстоянии друг от друга были поезда через 3 часа после выхода?

Answer 1

1)расстояние которое прошёл первый поезд до встречи

75*5=375 км

2)расстояние которое прошёл второй поезд до встречи

800-375=425 км

3)скорость второго поезда

425:5=85 км/час  (ответили на первый вопрос задачи)

4)скорость сближения 

75+85=160 км/час

5)расстояние которое пройдут поезда за 3 часа

160*3=480 км

6)расстояние между ними через 3 часа

800-480=320 км  (ответили на второй вопрос задачи)

Answer 2

Problem Analysis

We have two trains traveling towards each other from two different cities. The distance between the cities is 800 km. The first train's speed is given as 75 km/h. We need to find the speed of the second train and the distance between the trains after 3 hours.

Solution

To find the speed of the second train, we can use the formula:

Speed = Distance / Time

Let's calculate the speed of the second train:

Speed of the first train = 75 km/h

Distance = 800 km

Time = 5 hours

Using the formula, we can calculate the speed of the second train:

Speed of the second train = (Distance - Speed of the first train * Time) / Time

Speed of the second train = (800 - 75 * 5) / 5

Speed of the second train = (800 - 375) / 5

Speed of the second train = 425 / 5

Speed of the second train = 85 km/h

So, the speed of the second train is 85 km/h.

To find the distance between the trains after 3 hours, we can use the formula:

Distance = Speed * Time

Let's calculate the distance between the trains after 3 hours:

Speed of the second train = 85 km/h

Time = 3 hours

Using the formula, we can calculate the distance between the trains after 3 hours:

Distance = Speed of the second train * Time

Distance = 85 * 3

Distance = 255 km

So, the distance between the trains after 3 hours is 255 km.

Conclusion

The second train was traveling at a speed of 85 km/h. The distance between the trains after 3 hours was 255 km.

Please let me know if there is anything else I can help you with!