Question

Два поезда отошли от одной станции в противоположных направлениях . Скорость первого поезда равна 60 километрам в час , что составляет 3/4 скорости второго. Через сколько часов расстояние между ними будет 280 километров?

Answer 1

Через 2 часа 1 - поезд 60км, 2 - 80 км , 280 : (60 +80 ) =2 (ч) 

Answer 2

60 * 3/4 = 80 км/час скорость 2го поезда
60 + 80 = 140  суммарная скорость поездов
280 / 140 = 2 часа

Answer 3

Problem Analysis

We are given two trains that depart from the same station in opposite directions. The speed of the first train is 60 kilometers per hour, which is 3/4 of the speed of the second train. We need to determine the number of hours it will take for the distance between the two trains to be 280 kilometers.

Solution

Let's assume that the speed of the second train is x kilometers per hour. According to the problem, the speed of the first train is 3/4 of the speed of the second train. Therefore, we can write the equation:

60 = (3/4)x

To find the value of x, we can solve this equation:

x = (60 * 4) / 3 = 80 kilometers per hour

Now that we know the speed of the second train, we can calculate the time it takes for the distance between the two trains to be 280 kilometers. We can use the formula:

time = distance / speed

Substituting the values, we get:

time = 280 / 80 = 3.5 hours

Therefore, it will take 3.5 hours for the distance between the two trains to be 280 kilometers.

Answer

The distance between the two trains will be 280 kilometers after 3.5 hours.