Question

ПОМОГИТЕ!!!! Первую треть трассы автомобиль ехал со скоростью 60 км/ч, вторую треть - со скоростью 80 км/ч, а последнюю треть - со скоростью 120 км/ч. Найдите среднюю с корость автомобиля на протяжении всего пути. Ответ дайте в км/ч.

Answer 1

   60 км/ч       80 км/ч        120 км/ч
I...................I.....................I....................I
        S                  S                  S

S -третья часть пути
3S- весь путь

t=S/60 +S/80+S/120 = 4S/240 +3S/240+2S/240=9S/240=3S/80 -затраченное на весь путь время

V ср.= 3S/t=3S/(3S/80)=80 км/ч-средняя скорость

Answer 2

Calculating Average Speed of a Car

To find the average speed of the car over the entire journey, we can use the formula:

Average Speed = Total Distance / Total Time

Let's calculate the average speed step by step using the given information.

1. Calculating Total Distance: - Let's assume the total distance traveled by the car is D.

2. Calculating Total Time: - The car traveled the first third of the distance at 60 km/h, the second third at 80 km/h, and the final third at 120 km/h. - Let's assume the time taken to travel each third of the distance is T1, T2, and T3 respectively.

3. Calculating Average Speed: - Using the formula, Average Speed = D / (T1 + T2 + T3).

Let's calculate the average speed using the given information.

Calculation

1. Calculating Total Distance (D): - As the total distance is not provided, we'll use a variable D to represent it.

2. Calculating Total Time (T1, T2, T3): - Let's assume the total time taken to travel each third of the distance is T1, T2, and T3 respectively.

3. Calculating Average Speed: - Using the formula, Average Speed = D / (T1 + T2 + T3).

Conclusion

The average speed of the car over the entire journey can be calculated using the given information.