Question

Два потяги, пасажирський і товарний, рухаються назустріч один одному зі швидкостями 63 км/год і 45 км/год відповідно. Скільки часу бачитиме пасажир товарний потяг, що проходить повз, якщо довжина товарного потяга 300 м. Відповідь подайте в секундах, не вказуючи одиниць вимірювання.

Answer 1

Ответ:

63км/год+45км/год=108км/год-сума швидкості

108км/год/3,6=30м/с

300м/30м/с=10секунд

відповідь:10с

Объяснение:

Answer 2

Problem Analysis

We have two trains, a passenger train and a freight train, moving towards each other. The passenger train has a speed of 63 km/h, and the freight train has a speed of 45 km/h. We need to find out how much time the passenger train will see the freight train passing by if the length of the freight train is 300 meters.

Solution

To solve this problem, we can use the concept of relative velocity. The relative velocity is the difference between the velocities of two objects moving in opposite directions.

Let's calculate the relative velocity first: Relative velocity = Speed of passenger train + Speed of freight train

Given: Speed of passenger train = 63 km/h Speed of freight train = 45 km/h

Relative velocity = 63 km/h + 45 km/h = 108 km/h

Now, we need to convert the relative velocity from km/h to m/s: 1 km/h = 1000 m/3600 s (conversion factor)

Relative velocity = 108 km/h * (1000 m/3600 s) = 30 m/s

The passenger train will see the freight train passing by when the length of the freight train is covered by the relative velocity. Let's calculate the time it takes to cover the length of the freight train: Time = Distance / Relative velocity

Given: Length of freight train = 300 meters Relative velocity = 30 m/s

Time = 300 meters / 30 m/s = 10 seconds

Therefore, the passenger train will see the freight train passing by for 10 seconds.

Answer: The passenger train will see the freight train passing by for 10 seconds.