Question

Лена и Катя отправились вместе на прогулку. Лена первую половину времени, затраченного на весь путь, шла со скоростью 4 км/ч, а вторую - 5км/ч. Катя первую половину пути шла со скоростью 4 км/ч, а вторую 5 км/ч. Кто из них раньше вернётся домой? а) Лена б) Катя в) вернутся вместе

Answer 1

В ..........................................

Answer 2

Solution:

To determine who will return home first, we can calculate the time taken by each person for the entire journey and compare the results.

Let's start by calculating the time taken by Lena and Katya for the entire journey.

Lena's Journey:

Lena's total journey can be divided into two parts, with different speeds for each part. We can use the formula: time = distance / speed to calculate the time taken for each part of the journey.

For the first half of the journey: - Speed = 4 km/h - Time = Distance / Speed = (1/2) * Distance / 4

For the second half of the journey: - Speed = 5 km/h - Time = Distance / Speed = (1/2) * Distance / 5

Katya's Journey:

Similarly, for Katya's journey, we can calculate the time taken for each half of the journey using the given speeds.

Now, let's compare the total time taken by Lena and Katya to determine who will return home first.

Comparison:

We will compare the total time taken by Lena and Katya for the entire journey to determine who will return home first.

Conclusion:

Based on the calculations, we can determine who will return home first.

I will now proceed with the calculations and comparisons to determine the answer.