Question

С двух станции,расстояние межжу которыми 720км,вышли одновременно навстречу друг другу два поезда. Скорость первого поезда 75км/ч,а скорость второго на 10км/ч больше.на каком расстоянии друг от друга будут поезда через 4ч?

Answer 1

1) 75+10=85 км/ч скорость второго поезда
2) 75+85=160 км/ч общая скорость
3)160 × 4 = 640 км пройденное расстояние
4) 720 - 640 = 80 км
ответ: на расстоянии 80 км от друга будет два поезда через 4 часа

Answer 2

Problem Analysis

We are given two trains that start from two different stations and travel towards each other. The distance between the stations is 720 km. The first train has a speed of 75 km/h, and the second train has a speed that is 10 km/h faster than the first train. We need to find the distance between the trains after 4 hours.

Solution

To solve this problem, we can use the formula: distance = speed × time.

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

The first train's speed is 75 km/h, so the distance traveled by the first train after 4 hours is: distance1 = speed1 × time = 75 km/h × 4 h = 300 km.

The second train's speed is 10 km/h faster than the first train, so its speed is 75 km/h + 10 km/h = 85 km/h. Therefore, the distance traveled by the second train after 4 hours is: distance2 = speed2 × time = 85 km/h × 4 h = 340 km.

Now, let's calculate the distance between the trains after 4 hours. Since they are traveling towards each other, we can subtract the distance traveled by the first train from the total distance between the stations: distance_between_trains = total_distance - distance1 = 720 km - 300 km = 420 km.

Therefore, the trains will be 420 km apart after 4 hours.

Answer

The trains will be 420 km apart from each other after 4 hours.