Question

Первые 70 км автомобиль ехал со скоростью 70 км/ч, следующие 100 км со скоростью 50 км/ч, а последние 130 км со скоростью 65 км/ч. Найдите среднюю скорость автомобиля на протяжении всего пути.

Answer 1

1) 70 + 100 + 130 = 300 ( км ) общий путь
2) 70 : 70 + 100 : 50 + 130 : 65 = 1 + 2 + 2 = 5 ( час ) общее время
3) 300 : 5 = 60 ( км/час ) средняя скорость
Ответ 60 км/час

Answer 2

Средняя скорость = расстояние делить на общее время в пути.
Найдем S = 70+100+130=300 км
Найдем общее время T = t1+t2+t3
t1 = 70/70=1час
t2 = 100/50=2часа
t3 = 130/65 = 2 часа
T=1+2+2=5 часов

Средняя скорость равна S/T=300/5=60км/ч

Answer 3

Calculation of Average Speed

To find the average speed of the car over the entire distance, we need to calculate the total time taken and the total distance traveled.

The car traveled the following distances at different speeds: - First 70 km at a speed of 70 km/h - Next 100 km at a speed of 50 km/h - Last 130 km at a speed of 65 km/h

To calculate the total time taken, we can divide each distance by its corresponding speed and sum them up:

Total time = (70 km / 70 km/h) + (100 km / 50 km/h) + (130 km / 65 km/h)

To calculate the total distance traveled, we can simply add up the distances:

Total distance = 70 km + 100 km + 130 km

Finally, we can calculate the average speed by dividing the total distance by the total time:

Average speed = Total distance / Total time

Let's calculate the average speed step by step.

Calculation Steps

Step 1: Calculate the total time taken: - First 70 km at 70 km/h: 70 km / 70 km/h = 1 hour - Next 100 km at 50 km/h: 100 km / 50 km/h = 2 hours - Last 130 km at 65 km/h: 130 km / 65 km/h = 2 hours

Total time = 1 hour + 2 hours + 2 hours = 5 hours

Step 2: Calculate the total distance traveled: Total distance = 70 km + 100 km + 130 km = 300 km

Step 3: Calculate the average speed: Average speed = Total distance / Total time = 300 km / 5 hours = 60 km/h

Therefore, the average speed of the car over the entire distance is 60 km/h.