Question

Автомобиль проехал 3часа со скоростью 70 км/ч, затем ехал со скоростью 53 км/ч и проехал еще 1,5 часа, потом 30 минут, из-за поломки, со скоростью 21 км/ ч. Найти среднюю скорость движения автомобиля на всем пути. помогите умоляю ​

Answer 1

Ответ:

(70×3)+53-(21+30+5)=263-56=207

Answer 2

Calculation of Average Speed

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

Let's break down the journey into three parts:

1. The car traveled for 3 hours at a speed of 70 km/h. 2. Then, it traveled for 1.5 hours at a speed of 53 km/h. 3. Finally, it traveled for 30 minutes (0.5 hours) at a speed of 21 km/h due to a breakdown.

To calculate the total distance traveled, we sum up the distances covered in each part of the journey:

1. Distance covered in the first part: 3 hours * 70 km/h = 210 km. 2. Distance covered in the second part: 1.5 hours * 53 km/h = 79.5 km. 3. Distance covered in the third part: 0.5 hours * 21 km/h = 10.5 km.

The total distance traveled is the sum of these distances: 210 km + 79.5 km + 10.5 km = 300 km.

To calculate the total time taken, we sum up the times taken in each part of the journey:

1. Time taken in the first part: 3 hours. 2. Time taken in the second part: 1.5 hours. 3. Time taken in the third part: 0.5 hours.

The total time taken is the sum of these times: 3 hours + 1.5 hours + 0.5 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 = 300 km / 5 hours = 60 km/h.

Therefore, the average speed of the car throughout the entire journey is 60 km/h.