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?

Answer 1

Взаимная скорость поездов
56+34=90 (км/час)=90000/3600=25 (м/сек)
25*15=375 м - длина товарного поезда.

Answer 2

Calculation of the Length of the Freight Train

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

Length = Relative 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 relative speed of the two trains:

Relative Speed = Speed of Passenger Train + Speed of Freight Train

Relative Speed = 56 km/h + 34 km/h

Relative Speed = 90 km/h

Now, we can calculate the length of the freight train using the formula mentioned above:

Length = Relative Speed × Time

Length = 90 km/h × 15 seconds

To calculate the length in kilometers, we need to convert the time from seconds to hours:

Length = 90 km/h × (15 seconds ÷ 3600 seconds/hour)

Simplifying the calculation:

Length = 90 km/h × 0.00417 hours

Length ≈ 0.375 km

Therefore, the length of the freight train is approximately 0.375 kilometers.