Question

Пожалуйста помогите. Составь уравнение и реши задачу . Из посёлка одновременно в противоположных направлениях вышли два пешехода. Через 3 ч расстояние между ними было равно 27 км . Один из них шёл со скоростью4км/ч . С какой скоростью шёл второй пешеход

Answer 1

V1+V2=Vуд.  - формула скорости удаленности    
4+x=Vуд  
t=s/Vуд  
27/(4+х)=3  
27/3=4+х 
9=4+х 
х=9-4 
х=5 
Проверка 
27/(4+5)=3
3=3 
Ответ скорость второго пешехода 5 км/ч

Answer 2

Problem Analysis

To solve this problem, we need to find the speed at which the second pedestrian was walking. We are given that two pedestrians started walking in opposite directions from a village. After 3 hours, the distance between them was 27 km. One of the pedestrians was walking at a speed of 4 km/h. We need to determine the speed at which the second pedestrian was walking.

Solution

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

Since the two pedestrians are walking in opposite directions, their relative speed is the sum of their individual speeds. Therefore, the relative speed between the two pedestrians is 4 km/h + x km/h.

We are given that after 3 hours, the distance between them was 27 km. We can use the formula distance = speed × time to write the equation:

27 km = (4 km/h + x km/h) × 3 h

Now, let's solve this equation to find the value of x.

Solving the Equation

To solve the equation, we can start by simplifying the equation:

27 km = (4 km/h + x km/h) × 3 h

Simplifying the right side of the equation:

27 km = (4 + x) × 3 km/h

Expanding the right side of the equation:

27 km = 12 km/h + 3x km/h

Now, let's isolate x by subtracting 12 km/h from both sides of the equation:

27 km - 12 km/h = 3x km/h

Simplifying:

15 km = 3x km/h

Finally, let's solve for x by dividing both sides of the equation by 3 km/h:

x = 15 km / 3 km/h

Simplifying:

x = 5 km/h

Answer

Therefore, the second pedestrian was walking at a speed of 5 km/h.

Please let me know if there is anything else I can help you with!