Question

С двух станций , расстояние между которыми 720 км , вышли одновременно на встречу друг другу два поезда. Скорость 1 поезда 75 км/ч , а скорость второго на10 км/ч больше. На каком расстояние друг от друга будут поезда через 4 ч.

Answer 1

1)75+10=85 км/час скорость второго поезда

2)75+85=160 км/час скорость сближения поездов

3)160*4=640 км пройдут поезда за 4 часа

4)720-640=80 км расстояние между ними

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Answer 2

скорость второго поезда: 
75+10=85 (км/ч) 
 сумме скоростей: 
75+85=160 (км/ч) 
за 4ч они вместе прошли 160*4=640 (км) 
Между поездами расстояние 720-640=80 (км) 
Ответ: 80 км.

Answer 3

Problem Analysis

We have two trains that start at the same time and travel towards each other. The distance between the two stations is 720 km. The speed of the first train is 75 km/h, and the speed of the second train is 10 km/h faster than the first train. We need to find the distance between the trains after 4 hours.

Solution

To find the distance between the trains after 4 hours, we can calculate the total distance traveled by both trains and subtract it from the initial distance of 720 km.

Let's calculate the distance traveled by each train in 4 hours.

The first train travels at a speed of 75 km/h for 4 hours, so the distance traveled by the first train is: Distance of the first train = Speed of the first train × Time = 75 km/h × 4 h = 300 km.

The second train travels at a speed of 10 km/h faster than the first train, so its speed is 75 km/h + 10 km/h = 85 km/h. The distance traveled by the second train is: Distance of the second train = Speed of the second train × Time = 85 km/h × 4 h = 340 km.

Now, let's calculate the distance between the trains after 4 hours: Distance between the trains = Initial distance - (Distance of the first train + Distance of the second train) = 720 km - (300 km + 340 km) = 720 km - 640 km = 80 km.

Therefore, the distance between the trains after 4 hours is 80 km.

Answer

The distance between the two trains after 4 hours will be 80 km.