Question

Одновременно из двух сёл расстояние между которыми 24 км отправились навстречу друг-друг другу велосепедист и пешеход. Через 1,5 часа они встретились. Найдите скорость пешехода, если скорость велосепедиста 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 = 4км/ч скорость пешехода

Answer 2

Problem Analysis

We are given that a cyclist and a pedestrian start simultaneously from two different villages that are 24 km apart and are moving towards each other. After 1.5 hours, they meet. We need to find 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. Since the cyclist and the pedestrian are moving towards each other, their combined speed is the sum of their individual speeds.

The distance covered by the cyclist in 1.5 hours is given by: distance_cyclist = speed_cyclist * time = 12 km/h * 1.5 h = 18 km.

Similarly, the distance covered by the pedestrian in 1.5 hours is: distance_pedestrian = speed_pedestrian * time = v km/h * 1.5 h = 1.5v km.

Since they meet after 1.5 hours, the sum of the distances covered by the cyclist and the pedestrian should be equal to the total distance between the villages, which is 24 km.

Therefore, we can write the equation: distance_cyclist + distance_pedestrian = total_distance 18 km + 1.5v km = 24 km

Simplifying the equation, we can solve for the speed of the pedestrian: 1.5v km = 24 km - 18 km 1.5v km = 6 km v = 6 km / 1.5 h v = 4 km/h

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

Answer

The speed of the pedestrian is 4 km/h.