Question

Мотоциклист едет первую половину пути со скоростью 90 км/ч, а вторую половину пути — со скоростью 78 км/ч. Найди среднюю скорость мотоцикла на всём пути. Ответ округли до единиц.

Answer 1

Ответ:78, 75 км/ч.

Объяснение:

=2*70*90 / (70+90) = 78,75 км/ч.

Answer 2

Calculation of Average Speed

To find the average speed of the motorcyclist, we can use the formula:

Average Speed = Total Distance / Total Time

Let's assume that the total distance traveled by the motorcyclist is D and the total time taken is T.

The motorcyclist travels the first half of the distance at a speed of 90 km/h and the second half at a speed of 78 km/h.

The time taken to travel the first half of the distance can be calculated using the formula:

Time taken for the first half = Distance of the first half / Speed of the first half

Similarly, the time taken to travel the second half of the distance can be calculated using the formula:

Time taken for the second half = Distance of the second half / Speed of the second half

Since the distances of the first and second halves are equal, we can represent them as D/2.

Now, let's calculate the average speed step by step.

Calculation Steps:

1. Calculate the time taken for the first half of the distance: - Distance of the first half = D/2 - Speed of the first half = 90 km/h - Time taken for the first half = (D/2) / 90

2. Calculate the time taken for the second half of the distance: - Distance of the second half = D/2 - Speed of the second half = 78 km/h - Time taken for the second half = (D/2) / 78

3. Calculate the total time taken: - Total Time = Time taken for the first half + Time taken for the second half

4. Calculate the average speed: - Average Speed = Total Distance / Total Time - Average Speed = D / (Total Time)

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

Calculation:

1. Calculate the time taken for the first half: - Distance of the first half = D/2 - Speed of the first half = 90 km/h - Time taken for the first half = (D/2) / 90

2. Calculate the time taken for the second half: - Distance of the second half = D/2 - Speed of the second half = 78 km/h - Time taken for the second half = (D/2) / 78

3. Calculate the total time taken: - Total Time = Time taken for the first half + Time taken for the second half

4. Calculate the average speed: - Average Speed = D / (Total Time)

Since we don't have the specific value of the distance D, we cannot calculate the average speed without this information. Please provide the value of the total distance traveled by the motorcyclist, and I will be happy to help you calculate the average speed.