Question

Автомобиль ехал 4 часа со скоростью: 75 км/ч, 78 км/ч, 75 км/ч, 72 км/ч. Найдите среднюю скорость автомобиля за эти 4 часа. Прошу помогите знаю легко но я должна проверить!)

Answer 1

75+78+75+72=300(проехала машина за4часа) 300:4=75. средняя скорость машины

Answer 2

Calculation of Average Speed

To find the average speed of the car over the 4-hour journey, we need to calculate the total distance traveled and divide it by the total time taken.

Given the speeds of the car during the 4-hour journey: - Speed 1: 75 km/h - Speed 2: 78 km/h - Speed 3: 75 km/h - Speed 4: 72 km/h

We can calculate the total distance traveled by multiplying each speed by the corresponding time: - Distance 1: 75 km/h * 1 hour = 75 km - Distance 2: 78 km/h * 1 hour = 78 km - Distance 3: 75 km/h * 1 hour = 75 km - Distance 4: 72 km/h * 1 hour = 72 km

The total distance traveled is the sum of these distances: Total distance = Distance 1 + Distance 2 + Distance 3 + Distance 4

The total time taken is simply 4 hours.

To find the average speed, we divide the total distance by the total time: Average speed = Total distance / Total time

Let's calculate the average speed now.

Calculation:

Total distance = 75 km + 78 km + 75 km + 72 km = 300 km Total time = 4 hours

Average speed = 300 km / 4 hours = 75 km/h

Therefore, the average speed of the car over the 4-hour journey is 75 km/h.

Please let me know if there's anything else I can help you with!