Question

Поезд двигаясь равномерно со скоростью 57 км/ч, проезжает мимо идущего в том же направлении параллельно путям со скоростью 5 км/ч пешехода за 45 сек. Найдите длину поезда в метрах

Answer 1

V(сближения)=57-5=52(так как в одну сторону с поездом идет) t=45c=0,0125ч S=V*t=0,65км=650м

Answer 2

Problem Analysis

We are given that a train is moving uniformly at a speed of 57 km/h and passes a pedestrian walking in the same direction at a speed of 5 km/h in 45 seconds. We need to find the length of the train in meters.

Solution

To find the length of the train, we can use the formula:

Length = Relative Speed × Time

The relative speed is the difference between the speed of the train and the speed of the pedestrian. In this case, it is 57 km/h - 5 km/h = 52 km/h.

Now, we need to convert the relative speed from km/h to m/s, as the time is given in seconds. We can use the conversion factor: 1 km/h = 1000 m/3600 s = 5/18 m/s.

Let's calculate the length of the train using the given values.

Calculation

Relative Speed = 52 km/h = 52 × (5/18) m/s = 260/18 m/s

Time = 45 seconds

Length = Relative Speed × Time = (260/18) m/s × 45 s = (260 × 45)/(18) m = 650 m

Answer

The length of the train is 650 meters.

Explanation

When the train passes the pedestrian, it covers a distance equal to its own length in the given time. Therefore, the length of the train is equal to the distance covered by the train in that time.

Note: The sources provided did not contain any relevant information for this specific problem. The solution was derived using basic physics principles and calculations.