Question

Поезд шёл 2 ч со скоростью 80 км/ч и 3 ч со скоростью 90 км/ч. Найти среднюю скорость поезда.

Answer 1

(80*2+90*3):(2+3)=86
Всё очень просто.

Answer 2

1)80•2=160км - прошел со скоростью 80 км/ч
2)90•3=270км - прошел со скоростью 90км/ч
3)2+3=5 ч - общее время
4)270+160=430км - прошел вместе
5)430:5=86км/ч -средняя скорость поезда.
Ответ: 86 км/час.

Answer 3

Calculating the Average Speed of the Train

To find the average speed of the train, we can use the formula: average speed = total distance / total time.

The train traveled for 2 hours at a speed of 80 km/h and for 3 hours at a speed of 90 km/h.

First, let's calculate the total distance traveled by the train.

The distance traveled at 80 km/h for 2 hours is 80 km/h * 2 h = 160 km.

The distance traveled at 90 km/h for 3 hours is 90 km/h * 3 h = 270 km.

So, the total distance traveled by the train is 160 km + 270 km = 430 km.

Next, let's calculate the total time taken for the entire journey.

The total time taken for the journey is 2 hours + 3 hours = 5 hours.

Now, we can calculate the average speed of the train using the formula:

average speed = total distance / total time

average speed = 430 km / 5 h = 86 km/h.

Therefore, the average speed of the train for the entire journey is 86 km/h.