Question

Пешеход и велосипедист отправились одновременно из одного пункта в одном направлении. Пешеход двигался со скоростью 5 км/ч, велосипедист 10 км/ч. Велосипедист проехал 30 км и повернул обратно, двигаясь с той же скоростью. Через сколько часов после начала движения пешеход и велосипедист встретятся?

Answer 1

30 км:10км/ч=3(ч)-время за которое велосепедист проехал 30км
5км/ч * 3ч=15(км)-растояние которое прошел пешеход за 3 часа
Тоисть скорость велосепедиста в 2 раза больше чем скорость пешехода тогда оставшиеся 15 км : на 2= 7,5км- а 7,5=1,5xfcf
Отчет через1,5 часа они встретятся

Answer 2

Problem Analysis

We are given that a pedestrian and a cyclist start simultaneously from the same point and move in the same direction. The pedestrian moves at a speed of 5 km/h, while the cyclist moves at a speed of 10 km/h. The cyclist travels 30 km and then turns back, maintaining the same speed. We need to determine how many hours after the start the pedestrian and the cyclist will meet.

Solution

To solve this problem, we can use the concept of relative speed. The relative speed between the pedestrian and the cyclist is the difference in their speeds, which is 10 km/h - 5 km/h = 5 km/h.

Let's assume that the time taken for the pedestrian and the cyclist to meet is t hours. During this time, the pedestrian would have covered a distance of 5t km, and the cyclist would have covered a distance of 10t km.

Since the cyclist travels 30 km before turning back, the total distance covered by the cyclist is 30 km + 10t km = 40 km.

Now, we can set up the equation: Distance covered by the pedestrian = Distance covered by the cyclist 5t = 40

Solving this equation, we can find the value of t.

Calculation

5t = 40 t = 40/5 t = 8

Therefore, the pedestrian and the cyclist will meet after 8 hours.

Answer

The pedestrian and the cyclist will meet after 8 hours.