Question

Два поезда выехали с одной и той же станции одновременно в противоположных направлениях . один поезд движется со скоростью 60км/ч другой 90км/ч .на каком расстоянии друг от друга окажуться поезда через 2ч ? через сколько времени расстояние между поездами будет 450км?

Answer 1

1)90+60=150(км/ч) скорость удаления
2)150*2=300(км) будет между поездами через 2 ч
3)450:150=через 3 (ч) расстояние между поездами будет 450 км

Answer 2

Problem Analysis

We have two trains that start from the same station simultaneously but in opposite directions. The first train is traveling at a speed of 60 km/h, and the second train is traveling at a speed of 90 km/h. We need to determine the distance between the trains after 2 hours and the time it takes for the distance between the trains to be 450 km.

Distance between the Trains after 2 Hours

To find the distance between the trains after 2 hours, we can use the formula: distance = speed * time. Let's calculate the distance traveled by each train after 2 hours.

The first train travels at a speed of 60 km/h for 2 hours, so the distance traveled by the first train is 60 km/h * 2 h = 120 km.

The second train travels at a speed of 90 km/h for 2 hours, so the distance traveled by the second train is 90 km/h * 2 h = 180 km.

Therefore, after 2 hours, the distance between the trains will be the sum of the distances traveled by each train: 120 km + 180 km = 300 km.

Answer: The distance between the trains after 2 hours will be 300 km.

Time for the Distance between the Trains to be 450 km

To find the time it takes for the distance between the trains to be 450 km, we need to determine when the sum of the distances traveled by each train will be equal to 450 km.

Let's assume t is the time it takes for the distance between the trains to be 450 km.

The first train travels at a speed of 60 km/h, so the distance traveled by the first train in t hours is 60 km/h * t = 60t km.

The second train travels at a speed of 90 km/h, so the distance traveled by the second train in t hours is 90 km/h * t = 90t km.

The sum of the distances traveled by each train should be equal to 450 km:

60t km + 90t km = 450 km

Simplifying the equation:

150t km = 450 km

Dividing both sides of the equation by 150:

t = 450 km / 150 km/h = 3 hours

Therefore, it will take 3 hours for the distance between the trains to be 450 km.

Answer: The time it takes for the distance between the trains to be 450 km is 3 hours.

Summary

- After 2 hours, the distance between the trains will be 300 km. - It will take 3 hours for the distance between the trains to be 450 km.

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