Question

Поезд на магнитной подушке,развивает скорость до 560км/ч.Начальный отрезок пути 280км-за 45 мин,средний отрезок пути 280км-за 30 мин,а последний отрезок пути 280км-за 45.Определите среднюю скорость поезда на всём пути.​

Answer 1

Ответ:

v ср = всё расстояние / всё время

S = 280 * 3 = 840 км

t = 0.75 + 0.5 +0.75 = 2 ч

v = 840 / 2 = 420км/ч

Answer 2

Calculation of Average Speed

To calculate the average speed of the train on the entire journey, we need to find the total distance traveled and the total time taken.

Given information: - Initial segment: Distance = 280 km, Time = 45 minutes - Middle segment: Distance = 280 km, Time = 30 minutes - Final segment: Distance = 280 km, Time = 45 minutes

To find the total distance, we add up the distances of all three segments: 280 km + 280 km + 280 km = 840 km.

To find the total time, we add up the times of all three segments: 45 minutes + 30 minutes + 45 minutes = 120 minutes.

Now, we need to convert the total time to hours. Since there are 60 minutes in an hour, 120 minutes is equal to 2 hours.

Therefore, the total distance is 840 km and the total time is 2 hours.

To calculate the average speed, we divide the total distance by the total time: 840 km / 2 hours = 420 km/h.

So, the average speed of the train on the entire journey is 420 km/h.