Question

Отец и сын красят забор длиной 45 метров с разных концов. отец красит за час 5 метров , сын - 4 метра забора. через сколько часов забор будет покрашен , т. е. когда они встретятся?

Answer 1

Отец-5м/ч.
Сын-4м/ч.
Всего-45м
Через сколько встретятся?
Решение:
1)4+5=9(м/ч)-9 метро в за час красят вместе.
2)45÷9=5(часов)через это время вструтятся.
Ответ: через 5 часов.

Answer 2

Скорость с которой они красят забор: 4+5 = 9 метров в час
Покрасят за: 45 : 9 = 5 часов

Answer 3

Problem Analysis

The problem states that a father and son are painting a fence that is 45 meters long from opposite ends. The father can paint 5 meters of the fence in one hour, while the son can paint 4 meters of the fence in one hour. We need to determine how many hours it will take for them to meet.

Solution

To find the time it takes for the father and son to meet, we can calculate the combined distance they can paint in one hour. The father can paint 5 meters, and the son can paint 4 meters, so together they can paint 5 + 4 = 9 meters in one hour.

Since they are painting from opposite ends, the total distance they need to cover is 45 meters. We can divide the total distance by the combined distance they can paint in one hour to find the number of hours it will take for them to meet.

Let's calculate the answer:

Total distance: 45 meters Combined distance painted in one hour: 9 meters

To find the number of hours it will take for them to meet, we can divide the total distance by the combined distance painted in one hour:

45 meters / 9 meters = 5 hours

Therefore, it will take them 5 hours to meet and finish painting the fence.

Answer

It will take the father and son 5 hours to meet and finish painting the fence.