Question

Велосипедист проехал первую часть дистанции за 2 часа 20 минут, а вторую часть- за 3 часа 40 минут. Найдите среднюю скорость велосипедист (в м/ мин), если его скорость на первом участке пути была 240 м/ мин, а на втором- 204 м/ мин

Answer 1

2ч20мин=140 мин
3ч40мин=220 мин
1) 240*140=33600 м - первая часть
2) 204*220=44880 м - вторая часть
3) 33600+44880=78480 м - всего
4) 140+220=360 мин - всего
5) 78480:360=218 м/мин - средняя скорость

Answer 2

Calculation of Average Speed

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

Average Speed = Total Distance / Total Time

Let's calculate the average speed step by step.

1. First, let's calculate the total distance covered by the cyclist. We know that the cyclist covered the first part of the distance in 2 hours and 20 minutes, and the second part in 3 hours and 40 minutes.

- The distance covered in the first part = Speed on the first part × Time on the first part - The distance covered in the second part = Speed on the second part × Time on the second part

Let's calculate the distances covered in each part:

- Distance covered in the first part = 240 m/min × 2 hours 20 minutes - Distance covered in the second part = 204 m/min × 3 hours 40 minutes

To calculate the distances, we need to convert the time from hours and minutes to minutes:

- 2 hours 20 minutes = 2 × 60 minutes + 20 minutes = 140 minutes - 3 hours 40 minutes = 3 × 60 minutes + 40 minutes = 220 minutes

Now we can calculate the distances:

- Distance covered in the first part = 240 m/min × 140 minutes - Distance covered in the second part = 204 m/min × 220 minutes

2. Next, let's calculate the total time taken by the cyclist. We can add the time taken for the first and second parts:

- Total time = Time on the first part + Time on the second part

- Total time = 140 minutes + 220 minutes

3. Finally, we can calculate the average speed using the formula mentioned earlier:

- Average Speed = Total Distance / Total Time

Let's substitute the values we calculated earlier:

- Average Speed = (Distance covered in the first part + Distance covered in the second part) / (Time on the first part + Time on the second part)

- Average Speed = (240 m/min × 140 minutes + 204 m/min × 220 minutes) / (140 minutes + 220 minutes)

Now let's calculate the average speed using the given values and the steps mentioned above.