Question

Срочно! Участок AB автомобиль проехал со скоростью 60 км/ч, а участок BC 70 км/ч. Чему равна средняя скорость автомобиля на пути AC (AB=BC)?

Answer 1

Calculation of Average Speed

To calculate the average speed of a car on the path AC, where AB and BC have different speeds, we need to consider the distances and times traveled on each segment.

Let's assume that the distance AB is equal to the distance BC.

Given: - Speed on AB = 60 km/h - Speed on BC = 70 km/h

To find the average speed, we need to calculate the total distance traveled and the total time taken.

The distance traveled on AB is the same as the distance traveled on BC since AB = BC.

Let's denote the distance AB (or BC) as 'd'.

The time taken to travel on AB can be calculated using the formula: time = distance / speed. So, the time taken on AB is: time_AB = d / 60.

Similarly, the time taken on BC is: time_BC = d / 70.

The total distance traveled on the path AC is: total_distance = AB + BC = 2d.

The total time taken on the path AC is: total_time = time_AB + time_BC = (d / 60) + (d / 70).

Finally, the average speed is calculated as: average_speed = total_distance / total_time.

Let's substitute the values and calculate the average speed.

Average Speed Calculation:

- Distance AB = Distance BC = d - Speed on AB = 60 km/h - Speed on BC = 70 km/h

Total distance traveled on AC: total_distance = AB + BC = 2d

Total time taken on AC: total_time = (d / 60) + (d / 70)

Average speed: average_speed = total_distance / total_time

Now, let's calculate the average speed using the given information.

Calculation:

- Distance AB = Distance BC = d - Speed on AB = 60 km/h - Speed on BC = 70 km/h

Total distance traveled on AC: total_distance = AB + BC = 2d

Total time taken on AC: total_time = (d / 60) + (d / 70)

Average speed: average_speed = total_distance / total_time

Substituting the values:

total_distance = 2d total_time = (d / 60) + (d / 70)

average_speed = total_distance / total_time

Simplifying the expression:

average_speed = (2d) / ((d / 60) + (d / 70))

To find the average speed, we need to know the value of 'd' (the distance AB or BC). Unfortunately, the value of 'd' is not provided in the question. Without this information, we cannot calculate the average speed.

Please provide the value of 'd' (the distance AB or BC) so that we can calculate the average speed accurately.