Question

Из двух сел расстояние между которыми равно 39 км, одновременно в одном направлении вышел пешеход и выехал велосипедист.Через какое время велосипидист догонит пешехода,если скорость велосипедиста равно 30 км/ч а скоростью пешехода 4 км/ч

Answer 1

1)30-4=26(км/ч)-скорость сближения
2)39:26=1.5
Ответ:через 1 час 5 минут велосипедист догонит пешехода.

Answer 2

Problem Analysis

We are given that the distance between two villages is 39 km. A pedestrian and a cyclist start simultaneously from one of the villages in the same direction. We need to determine how long it will take for the cyclist to catch up to the pedestrian, given that the cyclist's speed is 30 km/h and the pedestrian's speed is 4 km/h.

Solution

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

Let's assume that the time it takes for the cyclist to catch up to the pedestrian is t hours. During this time, the pedestrian will have traveled a distance of 4t km, and the cyclist will have traveled a distance of 30t km.

Since the distance between the two villages is 39 km, we can set up the following equation:

4t + 30t = 39

Simplifying the equation, we get:

34t = 39

Solving for t, we find:

t = 39 / 34

Calculating this value, we get:

t ≈ 1.147 hours

Therefore, the cyclist will catch up to the pedestrian in approximately 1.147 hours.

Answer

The cyclist will catch up to the pedestrian in approximately 1.147 hours.

Explanation

When the cyclist and pedestrian start simultaneously from one of the villages, the cyclist's speed of 30 km/h allows them to cover a greater distance in a shorter time compared to the pedestrian's speed of 4 km/h. As a result, the cyclist will eventually catch up to the pedestrian. The time it takes for the cyclist to catch up to the pedestrian is approximately 1.147 hours.