Question

Андрей доехал на велосипеде от реки до деревни и вернулся обратно за 1 час, От рреки до древни он ехал со скоростью 10 км.ч а обратно 15 км.ч \чему равно расстояние от реки до деревни

Answer 1

Пусть путь равен х км, тогда Время на путь от реки до деревни равно х/10, обратно - х\15.

Составляем уравнение.

х\10+х\15=1

3х\30+2х\30=1

5х\30=1

х\6 =1

х=6

Ответ:6. 

 

Answer 2

Problem Analysis

Andrey traveled from the river to the village and back in a total of 1 hour. He traveled at a speed of 10 km/h from the river to the village and at a speed of 15 km/h on the way back. We need to find the distance from the river to the village.

Solution

Let's assume the distance from the river to the village is d kilometers.

When Andrey traveled from the river to the village at a speed of 10 km/h, the time taken can be calculated using the formula: time = distance / speed. Therefore, the time taken for this part of the journey is d / 10 hours.

When Andrey traveled from the village back to the river at a speed of 15 km/h, the time taken can be calculated using the same formula: time = distance / speed. Therefore, the time taken for this part of the journey is d / 15 hours.

Since the total time taken for the entire journey is 1 hour, we can write the equation: d / 10 + d / 15 = 1.

To solve this equation, we can find a common denominator and simplify it. Let's multiply both sides of the equation by 30 to eliminate the denominators:

3d + 2d = 30

Simplifying further:

5d = 30

Dividing both sides by 5:

d = 6

Therefore, the distance from the river to the village is 6 kilometers.

Answer

The distance from the river to the village is 6 kilometers.