Question

По параллельным путям в одну сторону движутся два электропоезда. Скорость первого поезда 54 км/ч (15м/с), второго 10м/с. Сколько времени будет продолжаться обгон, если длина каждого поезда 150м?

Answer 1

Скорость поездов относительно друг друга 5 м/с, 150 метров поезд проедет за
150/5=30 секунд  

Answer 2

Calculation of Overtaking Time

To calculate the time it takes for one train to overtake the other, we need to consider the relative speeds of the trains and the lengths of the trains.

Given: - Speed of the first train: 54 km/h (15 m/s) - Speed of the second train: 10 m/s - Length of each train: 150 m

To calculate the overtaking time, we can use the formula:

Time = Distance / Relative Speed

The relative speed is the difference in speeds between the two trains.

Let's calculate the overtaking time step by step:

1. Convert the speed of the first train from km/h to m/s: - Speed of the first train = 54 km/h = 54 * (1000/3600) m/s = 15 m/s

2. Calculate the relative speed: - Relative speed = Speed of the first train - Speed of the second train - Relative speed = 15 m/s - 10 m/s = 5 m/s

3. Calculate the distance the first train needs to cover to overtake the second train: - Distance = Length of the second train = 150 m

4. Calculate the overtaking time: - Time = Distance / Relative Speed - Time = 150 m / 5 m/s = 30 seconds

Therefore, it will take 30 seconds for the first train to overtake the second train.