Question

Пассажирский поезд следует вслед за товарным. В 6 часов утра расстояние между ними 7 км. Скорость пассажирского 80 км/ч, товарного - 60 км/ч. Через сколько произойдет встреча?

Answer 1

80-60=20 км/ч

7/20 (ч)=(7/20)*60=21 (мин)

пассажирский поезд догонит товарный в 6 ч21 мин

Answer 2

Problem Analysis

We are given that a passenger train is following a freight train. The distance between them at 6 am is 7 km. The passenger train has a speed of 80 km/h, while the freight train has a speed of 60 km/h. We need to determine how long it will take for them to meet.

Solution

To solve this problem, we can use the concept of relative speed. The relative speed is the difference between the speeds of the two objects. In this case, the relative speed is the sum of the speeds of the passenger and freight trains, which is 80 km/h + 60 km/h = 140 km/h.

We can calculate the time it takes for the two trains to meet by dividing the distance between them by their relative speed. In this case, the distance between them is 7 km.

Using the formula: time = distance / speed, we can calculate the time it takes for the two trains to meet.

Calculation

Let's calculate the time it takes for the two trains to meet:

Distance between the trains: 7 km

Relative speed of the trains: 140 km/h

Time = Distance / Speed = 7 km / 140 km/h

Calculating the time:

Time = 0.05 hours

Answer

The passenger train and the freight train will meet after approximately 0.05 hours, or 3 minutes.

Please note that the answer provided is based on the information given in the question.