Question

Из поселка одновременно в противоположных направлениях отправились пешеход и велосипидист. Когда велосипидист проехал 3 ч со скоростью 14 км в час расстояние между ними стала 38 км.Найти скорость пешехода

Answer 1

Скорость Время Расстояние
Скорость вел 14км/ч 3ч 38км
Скорость пеш ?км/ч 3ч 38км
1)14×3=42(км)-проехал велосепидист.
2)42-38=4(км/ч)-скорость пешехода.
Ответ:4км/ч

Answer 2

Problem Analysis

We are given that a pedestrian and a cyclist start simultaneously from a village in opposite directions. After the cyclist has traveled for 3 hours at a speed of 14 km/h, the distance between them is 38 km. We need to find the speed of the pedestrian.

Solution

Let's assume the speed of the pedestrian is x km/h.

After 3 hours, the cyclist has traveled a distance of 3 * 14 = 42 km.

At this point, the distance between the pedestrian and the cyclist is 38 km.

Since they are moving in opposite directions, the total distance covered by both of them is the sum of their individual distances.

So, the total distance covered by the pedestrian and the cyclist is 42 km + 38 km = 80 km.

We can set up the following equation to represent the situation:

Distance covered by the pedestrian + Distance covered by the cyclist = Total distance

Let's solve this equation to find the speed of the pedestrian.

x * 3 + 14 * 3 = 80

Simplifying the equation:

3x + 42 = 80

3x = 80 - 42

3x = 38

x = 38 / 3

x ≈ 12.67

Therefore, the speed of the pedestrian is approximately 12.67 km/h.

Answer

The speed of the pedestrian is approximately 12.67 km/h.