Question

Автомобиль двигался 3,3 ч по шоссе со скоростью 94 км/ч, затем 1,3 ч по грунтовой дороге со скоростью 41 км/ч, наконец, 0,4 ч по просёлочной дороге со скоростью 26 км/ч. Найдите среднюю скорость движения автомобиля на всём пути.

Answer 1

Средняя скорость=Растояние/Время
S1=3.3*94=310км(шоссе)
S2=1.3*41=53.3км(грунтовая дорога)
S3=0.4*26=10.4км(просёлочная дорога)
S=S1+S2+S3=310+53.3+10.4=373.7км
Общее время=3.3+1.3+0.4=5 часов
Средняя скорость 373.7/5=74.74км/ч
Ответ: 74.74 км/ч

Answer 2

Calculation of Average Speed

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

The car traveled for: - 3.3 hours on the highway at a speed of 94 km/h, - 1.3 hours on a dirt road at a speed of 41 km/h, and - 0.4 hours on a rough road at a speed of 26 km/h.

To calculate the total distance traveled, we add up the distances traveled on each type of road: - Distance on the highway = 3.3 hours * 94 km/h = 310.2 km - Distance on the dirt road = 1.3 hours * 41 km/h = 53.3 km - Distance on the rough road = 0.4 hours * 26 km/h = 10.4 km

The total distance traveled is 310.2 km + 53.3 km + 10.4 km = 373.9 km.

To calculate the total time taken, we add up the times taken on each type of road: - Time on the highway = 3.3 hours - Time on the dirt road = 1.3 hours - Time on the rough road = 0.4 hours

The total time taken is 3.3 hours + 1.3 hours + 0.4 hours = 5 hours.

Now, we can calculate the average speed by dividing the total distance traveled by the total time taken: Average speed = Total distance / Total time = 373.9 km / 5 hours = 74.78 km/h.

Therefore, the average speed of the car on the entire journey is approximately 74.78 km/h.