Question

Из пункта А в пункт В, расстояние между которыми 17 км, выехал велосипедист со скоростью 12 км/ч. Одновременно с ним из А в В вышел пешеход со скоростью 5 км/ч. Велосипедист доехал до В, повернул и поехал назад с той же скоростью. Через сколько часов после начала движения они встретятся?

Answer 1

Мой ответ :через 2 часа
Решение:Расстояние делим на скорость велосипедиста и пешехода 17:12=1,4 (велосипедист)
17:5=3,4 (пешеход)
Теперь отнимаем время пешехода и велосипедиста 3,4-1,4=2ч (ответ)

Answer 2

Problem Analysis

We are given that a cyclist and a pedestrian start simultaneously from point A and travel towards point B, which are 17 km apart. The cyclist travels at a speed of 12 km/h, while the pedestrian travels at a speed of 5 km/h. The cyclist reaches point B, turns around, and travels back towards point A at the same speed. We need to determine how many hours it will take for the cyclist and the pedestrian to meet.

Solution

To solve this problem, we can use the concept of relative speed. The relative speed between the cyclist and the pedestrian is the sum of their individual speeds. In this case, the relative speed is 12 km/h + 5 km/h = 17 km/h.

Since the distance between point A and point B is 17 km, the time it takes for the cyclist and the pedestrian to meet can be calculated using the formula:

Time = Distance / Relative Speed

Substituting the values, we get:

Time = 17 km / 17 km/h = 1 hour

Therefore, the cyclist and the pedestrian will meet 1 hour after they start their journey.

Answer

The cyclist and the pedestrian will meet 1 hour after they start their journey.