Question

первую треть времени автомобиль движется со скоростью 30км/ч,а оставшееся время со скоростью 54км/ч. средняя путевая скорость автомобиля равна?

Answer 1

Ответ: 46 км/ч

Объяснение: На фото. Если недостаточно подробно, могу объяснить

Answer 2

Calculation of Average Speed

To calculate the average speed of a car that travels at different speeds for different durations, we can use the formula:

Average Speed = Total Distance / Total Time

In this case, we are given that the car travels at a speed of 30 km/h for the first third of the time and at a speed of 54 km/h for the remaining time.

Let's assume that the total time is represented by T.

The first third of the time is T/3, and the remaining time is 2T/3.

To calculate the total distance traveled, we can add the distances traveled at each speed:

Total Distance = Distance at 30 km/h + Distance at 54 km/h

The distance traveled at 30 km/h can be calculated by multiplying the speed by the time:

Distance at 30 km/h = 30 km/h * (T/3)

Similarly, the distance traveled at 54 km/h can be calculated as:

Distance at 54 km/h = 54 km/h * (2T/3)

Now, we can substitute these values into the formula for average speed:

Average Speed = (30 km/h * (T/3) + 54 km/h * (2T/3)) / T

Simplifying the equation:

Average Speed = (10T + 36T) / 3T

Average Speed = 46T / 3T

Average Speed = 46 / 3

Therefore, the average speed of the car is 15.33 km/h.

Please note that this calculation assumes a constant speed during each interval and does not take into account factors such as acceleration or deceleration.