Question

Для строительства стадиона 5 бульдозеров расчистили площадку за 6 часов.За какое время расчистят эту же площадку 9 бульдозеров? а.5 часов б.4 часа 15 минут в.4 часа г.3 часа 20 минут

Answer 1

9 бульдозеров расчичтят эту же площадь за 3 часа 20 минут

Answer 2

Г наверное 3 часа 20 мин

Answer 3

Problem Analysis

To solve this problem, we need to determine how long it will take 9 bulldozers to clear the same area that 5 bulldozers cleared in 6 hours.

Solution

Let's assume that the rate at which each bulldozer clears the area is constant. Therefore, the time it takes to clear the area is inversely proportional to the number of bulldozers.

We can set up a proportion to solve for the unknown time:

5 bulldozers : 6 hours = 9 bulldozers : x hours

To solve this proportion, we can use cross-multiplication:

5 * x = 6 * 9

Simplifying the equation:

5x = 54

Dividing both sides by 5:

x = 54 / 5

Calculating the result:

x = 10.8 hours

Therefore, it will take 9 bulldozers approximately 10.8 hours to clear the same area.

Answer

The correct answer is 10.8 hours (approximately).