Question

Олена поїхала велосипедом на річку, що розташована за 4 км від дому, і витратила на це 9 хвилин. Додому вона поверталася коротшою дорогою (3 км) та витратила лише 6 хвилин. Яка була середня швидкість Олени (у км/год) під час її поїздки на річку й назад?

Answer 1

Ответ:

9÷4=1,25км/год - до річки

6÷3=2 км/год - до дому

1,25+2=3,25 км

3,25÷2=1,625 км/год - середня швидкість

Пошаговое объяснение:

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Answer 2

To calculate the average speed of Elena during her trip to the river and back, we need to determine the total distance traveled and the total time taken.

Elena traveled 4 km to the river and spent 9 minutes on this journey. She then returned home using a shorter route of 3 km, which took her only 6 minutes.

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

Average Speed = Total Distance / Total Time

Let's calculate the average speed step by step:

1. Convert the time taken to hours: - Elena spent 9 minutes traveling to the river, which is equal to 9/60 = 0.15 hours. - Elena spent 6 minutes returning home, which is equal to 6/60 = 0.1 hours.

2. Calculate the total distance: - Elena traveled 4 km to the river and 3 km back home, so the total distance is 4 + 3 = 7 km.

3. Calculate the total time: - The total time taken is the sum of the time taken to go to the river and the time taken to return home: 0.15 + 0.1 = 0.25 hours.

4. Calculate the average speed: - Using the formula, Average Speed = Total Distance / Total Time, we can substitute the values: Average Speed = 7 km / 0.25 hours = 28 km/h.

Therefore, the average speed of Elena during her trip to the river and back was 28 km/h.