Question

Велосипедист проехал первую половину пути со скоростью 12км/ч ,а вторую 20км/ч.Отпределите среднюю скорость движения велосипедиста.

Answer 1

12+20=32км/ч
32/2=16км/ч средняя скорость на всем протяжении пути

Answer 2

Calculating the Average Speed of the Cyclist

To calculate the average speed of the cyclist, we can use the formula:

Average Speed = Total Distance / Total Time

The cyclist traveled the first half of the distance at a speed of 12 km/h and the second half at a speed of 20 km/h.

Let's denote: - V1 as the speed for the first half of the distance (12 km/h) - V2 as the speed for the second half of the distance (20 km/h)

We can calculate the average speed using the given speeds and the concept of uniform motion.

Calculation

1. We'll first calculate the time taken for each half of the distance using the formula time = distance / speed. 2. Then, we'll find the total time taken for the entire journey. 3. Finally, we'll use the formula for average speed to find the average speed of the cyclist.

Calculation Steps

1. Time taken for the first half of the distance: - Distance = D1 (let's assume the total distance is D) - Speed = V1 - Time = D1 / V1

2. Time taken for the second half of the distance: - Distance = D2 (which is also D1 since the distance is halved) - Speed = V2 - Time = D2 / V2

3. Total time taken for the entire journey: - Total Time = Time for the first half + Time for the second half

4. Average Speed: - Average Speed = Total Distance / Total Time

Let's calculate the average speed using the given speeds and the concept of uniform motion.

Calculation

1. Time taken for the first half of the distance: - Time = D1 / V1 = 0.5D / 12 = 0.0417D

2. Time taken for the second half of the distance: - Time = D2 / V2 = 0.5D / 20 = 0.025D

3. Total time taken for the entire journey: - Total Time = 0.0417D + 0.025D = 0.0667D

4. Average Speed: - Average Speed = Total Distance / Total Time = D / 0.0667D = 15 km/h

So, the average speed of the cyclist is 15 km/h. This means that the cyclist's overall average speed for the entire journey is 15 kilometers per hour.

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