Question

Першу половину свого шляху мотоцикліст рухався з швидкістю 20 км/год, а другу половину шляху - з швидкістю 30 км/год. Яка середня швидкість навсьому шляху?​

Answer 1

Ответ:

(30+20):2= 25 км /год - ответ

Answer 2

Calculating Average Speed for the Entire Journey

To find the average speed for the entire journey, we can use the formula for average speed, which is the total distance traveled divided by the total time taken.

The total distance traveled is the sum of the distances covered in the first half and the second half of the journey.

The total time taken is the sum of the times taken for the first half and the second half of the journey.

Calculating Distance and Time for Each Half of the Journey

Let's start by calculating the distance and time for each half of the journey.

For the first half of the journey: - Speed = 20 km/h - Let's assume the distance for the first half is D1 km. - Time taken for the first half = Distance / Speed = D1 / 20

For the second half of the journey: - Speed = 30 km/h - Let's assume the distance for the second half is D2 km. - Time taken for the second half = Distance / Speed = D2 / 30

Finding the Total Distance and Total Time

The total distance for the entire journey is the sum of the distances for the first and second halves: Total distance = D1 + D2

The total time for the entire journey is the sum of the times for the first and second halves: Total time = (D1 / 20) + (D2 / 30)

Calculating the Average Speed

Now, we can use the formula for average speed: Average speed = Total distance / Total time

By plugging in the values for total distance and total time, we can calculate the average speed for the entire journey.