Question

одновременно из двух сел расстояние между которыми 24км отправились навстречу друг другу велосипедист и пешеход через 1,5ч они встретились определите скорость пешехода если скорость велосипедиста 12 км/ч

Answer 1

12 * 1,5 = 18 км проехал велосипедист за 1,5 часа.

24 - 18 = 6 км прошел пешеход

6 : 1,5 = 4 км/ч скорость пешехода.

Ответ. 4 км/ч. 

Answer 2

Problem Analysis

We are given that two individuals, a cyclist and a pedestrian, start simultaneously from two different villages that are 24 km apart. After 1.5 hours, they meet each other. We need to determine the speed of the pedestrian, given that the speed of the cyclist is 12 km/h.

Solution

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

To solve this problem, we can use the formula: distance = speed × time.

The cyclist travels for 1.5 hours at a speed of 12 km/h, so the distance traveled by the cyclist is: distance_cyclist = speed_cyclist × time = 12 km/h × 1.5 h = 18 km.

The pedestrian also travels for 1.5 hours, so the distance traveled by the pedestrian is: distance_pedestrian = speed_pedestrian × time = v km/h × 1.5 h = 1.5v km.

Since they meet each other, the sum of their distances traveled must be equal to the total distance between the villages: distance_cyclist + distance_pedestrian = 24 km.

Substituting the known values, we have: 18 km + 1.5v km = 24 km.

Now, we can solve this equation to find the speed of the pedestrian.

Calculation

Let's solve the equation: 18 km + 1.5v km = 24 km.

Subtracting 18 km from both sides: 1.5v km = 6 km.

Dividing both sides by 1.5: v km = 4 km.

Answer

Therefore, the speed of the pedestrian is 4 km/h.

Verification

To verify our answer, let's substitute the values back into the equation: 18 km + 1.5v km = 24 km.

Substituting v = 4 km/h: 18 km + 1.5 × 4 km = 24 km.

Simplifying the equation: 18 km + 6 km = 24 km.

Adding the terms: 24 km = 24 km.

The equation is true, which confirms that our answer is correct.

Conclusion

The speed of the pedestrian is 4 km/h.