Question

Пассажир поезда, идущего со скоростью 79,2км/ч , заметил, что встречный поезд шёл мимо него в течении 12 секунд . Определите скорость встречного поезда, если его длина – 480 метров.

Answer 1

480 м : 12 сек = 40 м/сек = 144 км/час (так как 1 км = 1000 м, а 1 час = 3600 сек) (144 км/час - это сумма скоростей поездов)
144 км/час - 79,2 км/час = 64,8 км/час
Ответ: скорость встречного поезда 64,8 км/час

Answer 2

Calculation of the Speed of the Oncoming Train

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

Speed = Distance / Time

Given that the passenger in the train observed the oncoming train for 12 seconds and the length of the oncoming train is 480 meters, we can calculate the speed of the oncoming train.

Let's plug in the values into the formula:

Speed = 480 meters / 12 seconds

Calculating this, we find that the speed of the oncoming train is 40 meters per second.

Please note that the speed of the train was given in kilometers per hour, so we need to convert it to meters per second for the calculation.

To convert the speed from kilometers per hour to meters per second, we can use the conversion factor:

1 kilometer = 1000 meters 1 hour = 3600 seconds

Therefore, to convert the speed from kilometers per hour to meters per second, we divide the speed in kilometers per hour by 3.6.

Given that the speed of the train is 79.2 kilometers per hour, we can convert it to meters per second:

Speed = 79.2 km/h / 3.6

Calculating this, we find that the speed of the train is approximately 22 meters per second.

So, the speed of the oncoming train is 40 meters per second.