Question

Пассажир едет в поезде, который идет со скоростью 60 км/ч, и видит , что мимо окна проходит встречный поезд в течение 4 секунд. Какова скорость встречного поезда, если его длина равна 120 м?

Answer 1

1 час = 60 * 60 = 3600 сек  ;  1 км = 1000 м
Скорость поезда в котором едет пассажир  равна : 60 * 1000 / 3600 = 50/3  м/сек
Общая скорость поездов равна 120 / 4 = 30 м/сек
Скорость с которой проходит встречный поезд равна :30 - 50/3 = 90/3 - 50/3 =
40/3 м/сек = 40/3 *3600 /1000= 48 км/ч

Answer 2

Calculation of the Speed of the Oncoming Train

To calculate the speed of the oncoming train, we can use the formula:

Speed = Distance / Time

Given that the passenger sees the oncoming train passing by the window for a duration of 4 seconds and the length of the oncoming train is 120 meters, we can calculate the speed of the oncoming train.

Let's calculate the speed:

Distance = Length of the oncoming train = 120 meters

Time = Duration the oncoming train is visible = 4 seconds

Using the formula, we can calculate the speed:

Speed = 120 meters / 4 seconds = 30 meters per second

Therefore, the speed of the oncoming train is 30 meters per second.

Please note that the above calculation assumes that the passenger is stationary and the measurements are taken from their perspective.