Question

Со станции вышел товарный поезд со скоростью 50 км/Ч .Через 3 часа с той же станции вслед за ним вышел электропоезд со скоростью 80км/ч.Через сколько часов после своего выхода электропоезд догонит товарный поезд?плиз срочно(((****

Answer 1

50*3=150 км - успел пройти товарный поезд

80-50=30 км/ч - скорость сближения поездов

150:30=5 ч

 

Ответ: через 5 часов после своего выхода электропоезд догонит товарный поезд.

Answer 2

пусть время через которое электропоезд догонит товарный=Х

тогда 50х+150=80х

 30х=150

х=5часов)

 

Answer 3

Problem Analysis

We are given that a freight train leaves a station with a speed of 50 km/h, and after 3 hours, an electric train leaves the same station with a speed of 80 km/h. We need to determine how many hours it will take for the electric train to catch up to the freight train.

Solution

To solve this problem, we can use the formula: time = distance / speed.

Let's assume that the time it takes for the electric train to catch up to the freight train is t hours. During this time, the freight train will have traveled a distance of 50 * t km, and the electric train will have traveled a distance of 80 * t km.

Since the electric train catches up to the freight train, the distances traveled by both trains must be equal. Therefore, we can set up the following equation:

50 * t = 80 * t

Simplifying the equation, we get:

80 * t - 50 * t = 0

30 * t = 0

t = 0

The equation has no solution, which means that the electric train will never catch up to the freight train.

Answer

The electric train will never catch up to the freight train.