Question

Из пунктов А и В одновременно вышли два пешехода. они встретились через 20 мин после выхода , а через 10 мин ещё первый пришёл в пункт В. Через какое время после своего выхода из В второй пешеход пришел в пункт А?

Answer 1

Пусть пешеходы встретились в пункте С.
Тогда первый пешеход путь от С до В преодолел за 10 мин после встречи, а второй пешеход от В до С преодолел за 20 мин до встречи.
А поскольку путь от С до В равен пути от В до С то второй пешеход идет в два раза медленнее, поэтому путь от С до А второй пешеход пройдет за 20*2=40 минут
А путь от В до А он пройдет за 40+20=60 мин= 1 час
Ответ: за 1 час второй пешеход пройдет путь от В до А

Answer 2

Problem Analysis

Two pedestrians simultaneously left points A and B. They met after 20 minutes, and 10 minutes later, the first pedestrian arrived at point B. We need to determine how much time passed after leaving point B until the second pedestrian arrived at point A.

Solution

Let's break down the information given: - Two pedestrians left points A and B simultaneously. - They met after 20 minutes. - The first pedestrian arrived at point B 10 minutes after they met.

To find out how much time passed after leaving point B until the second pedestrian arrived at point A, we need to calculate the time it took for the first pedestrian to travel from point B to point A.

Let's denote the time it took for the first pedestrian to travel from point B to point A as x minutes.

From the given information, we can create the following equation: - The first pedestrian traveled from point B to point A in x minutes. - The first pedestrian traveled from point A to the meeting point in 20 minutes. - The second pedestrian traveled from point B to the meeting point in 20 minutes. - The first pedestrian arrived at point B 10 minutes after the meeting.

Therefore, the total time it took for the first pedestrian to travel from point B to point A is x + 20 + 10 minutes.

Since the two pedestrians left their respective points simultaneously, the total time it took for the second pedestrian to travel from point B to point A is also x + 20 + 10 minutes.

Hence, the second pedestrian arrived at point A x + 20 + 10 minutes after leaving point B.

Calculation

To find the value of x, we need more information or additional equations. The given information is not sufficient to determine the exact time it took for the second pedestrian to arrive at point A after leaving point B.

Please provide any additional information or equations to solve the problem accurately.