Question

Пассажирский поезд , двигавшийся со скоростью 56км/ч,прошел мимо встречного товарного поезда, двигавшегося со скоростью 34км/ч , за 15 с . Какова длина товарного поезда ? Помогите пожалуйста))))

Answer 1

1) Их совместная скорость=90 км\ч=25 м\сек. , отсюда длина товарного поезда=25*15=375 м.
2) Их совместная скорость=180/8=22,5 м\сек=81 км\ч. , отсюда скорость пассажирского поезда=81-36=45 км\ч                      НАВЕРНО ПРАВИЛЬНО???

Answer 2

Calculation of the Length of the Freight Train

To calculate the length of the freight train, we can use the formula:

Length = Speed × Time

Given that the passenger train is moving at a speed of 56 km/h and passes the freight train in 15 seconds, we can calculate the length of the freight train as follows:

Length of Freight Train = Speed of Freight Train × Time

The speed of the freight train is given as 34 km/h, and the time it takes for the passenger train to pass it is 15 seconds.

Let's calculate the length of the freight train:

Length of Freight Train = 34 km/h × 15 seconds

To perform the calculation, we need to convert the speed from km/h to m/s, as the time is given in seconds. We know that 1 km/h is equal to 0.2778 m/s.

Converting the speed of the freight train:

Speed of Freight Train = 34 km/h × 0.2778 m/s/km

Now, let's calculate the length of the freight train:

Length of Freight Train = (34 km/h × 0.2778 m/s/km) × 15 seconds

Calculating the length:

Length of Freight Train = 34 km/h × 0.2778 m/s/km × 15 seconds

Simplifying the calculation:

Length of Freight Train = 34 × 0.2778 × 15 meters

Now, we can calculate the length of the freight train:

Length of Freight Train = 141.57 meters

Therefore, the length of the freight train is approximately 141.57 meters.

Please note that the calculation assumes that both trains are moving in a straight line and that there are no other factors affecting the calculation.