Question

По двум параллельным железнодорожным путям в одном направлении следуют пассажирский и товарный поезда,со скорости которых равны соответственно 110 км/ч и 70 км/ч.длина товарного поезда равна 1800 метрам.найдите длину пассажирского поезда ,если время ,за которое он прошел мимо товарного поезда,равно 3 минутам .

Answer 1

Интересная задача) Вроде 2км, а 1.8км как путаницу добавили) 
Если учитывать разницу скоростей, то пассажирский на скорости 40км/ч прошёл мимо товарного поезда за 3мин =>S=V*T = 40*0,05=2км
Не уверен , что так) 

Answer 2

Problem Analysis

We are given that a passenger train and a freight train are traveling in the same direction along two parallel railway tracks. The speeds of the trains are given, as well as the length of the freight train. We need to find the length of the passenger train, given that it takes 3 minutes for the passenger train to pass the freight train.

Solution

Let's denote the length of the passenger train as L.

We know that the speed of the passenger train is 110 km/h, which is equivalent to 110,000 meters per hour. Similarly, the speed of the freight train is 70 km/h, which is equivalent to 70,000 meters per hour.

We also know that the length of the freight train is 1800 meters.

To find the length of the passenger train, we can use the formula:

Length = Speed × Time

Since the passenger train takes 3 minutes to pass the freight train, which is equivalent to 3/60 = 1/20 hours, we can calculate the length of the passenger train as follows:

L = (110,000 m/h) × (1/20 h)

Let's calculate the length of the passenger train.

Calculation

Using the given values, we can calculate the length of the passenger train as follows:

L = (110,000 m/h) × (1/20 h) = 5,500 meters

Therefore, the length of the passenger train is 5,500 meters.

Answer

The length of the passenger train is 5,500 meters.

Please let me know if there is anything else I can help you with.