Question

Со станции одновременно в одном направление вышли два электропоезда один со скоростью 80 км/ч а другой 75 км/ч . Через сколько часов растояние между ними будет 15 км?

Answer 1

Vудаления=80-75=5км/ч
t=s/v; t=3 часа

Answer 2

Problem Analysis

We have two trains that start simultaneously from a station, one with a speed of 80 km/h and the other with a speed of 75 km/h. We need to find out how many hours it will take for the distance between them to be 15 km.

Solution

To solve this problem, we can use the formula: distance = speed × time. We can set up two equations using this formula, one for each train, and then solve for the time it takes for the distance between them to be 15 km.

Let's assume that the time taken by both trains is 't' hours.

For the first train: - Speed = 80 km/h - Distance = 80t km

For the second train: - Speed = 75 km/h - Distance = 75t km

According to the problem, the distance between the two trains is 15 km. So, we can set up the following equation:

80t - 75t = 15

Simplifying the equation, we get:

5t = 15

Dividing both sides by 5, we find:

t = 3

Therefore, it will take 3 hours for the distance between the two trains to be 15 km.

Answer

It will take 3 hours for the distance between the two trains to be 15 km.