Question

Автомобиль проехал половину пути со скоростью 60 км\ч, оставшуюся часть пути он половину времени шел со скоростью 45 км\ч, а последний участок - со скоростью 15 км\ч. Найдите среднюю скорость автомобиля на всем пути

Answer 1

(60+45+15):3=40км/ч
Ответ: 40км/ч

Answer 2

Calculation of Average Speed

To find the average speed of the car for 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 half of the distance at a speed of 60 km/h. 2. The car traveled the remaining half of the distance for half the time at a speed of 45 km/h. 3. The car traveled the last part of the distance for the remaining half of the time at a speed of 15 km/h.

Let's calculate the average speed step by step:

1. Calculate the distance traveled in each part: - The first part of the journey covers half the distance, so the distance traveled is 0.5d. - The second part of the journey also covers half the distance, so the distance traveled is 0.5d. - The third part of the journey covers the remaining distance, which is also 0.5d.

2. Calculate the time taken in each part: - The first part of the journey is traveled at a speed of 60 km