Question

Сколько понадобится времени 9 бульдозерам, чтобы расчистить площадку, которую 7 бульдозеров расчищают за 6,3 ч? 2 ПОПРОСИ БОЛЬШЕ ОБЪЯСНЕНИЙ

Answer 1

Решается обратной пропорцией. 7 бульдозеров за 6,3 часа, 9 бульдозеров за х часов. х=7*6,3:9=4,9. Ответ 4,9 часа.

Answer 2

Time Required for Bulldozers to Clear the Area

To calculate the time required for 9 bulldozers to clear the area, we can use the given information that 7 bulldozers can clear the area in 6.3 hours.

Step 1: Calculate the Work Rate of 1 Bulldozer We can start by calculating the work rate of 1 bulldozer using the given information.

Step 2: Use the Work Rate to Calculate the Time Required for 9 Bulldozers Once we have the work rate of 1 bulldozer, we can use it to calculate the time required for 9 bulldozers to clear the same area.

Calculation

Step 1: Calculate the Work Rate of 1 Bulldozer Given: - 7 bulldozers can clear the area in 6.3 hours.

The work rate of 1 bulldozer can be calculated using the formula: \[ \text{Work Rate} = \frac{\text{Amount of Work}}{\text{Time}} \]

Using the given information: \[ \text{Work Rate of 1 Bulldozer} = \frac{\text{Amount of Work}}{\text{Time}} = \frac{1}{7 \times 6.3} \]

\[ \text{Work Rate of 1 Bulldozer} = \frac{1}{44.1} \]

\[ \text{Work Rate of 1 Bulldozer} \approx 0.0227 \]

Step 2: Use the Work Rate to Calculate the Time Required for 9 Bulldozers Now that we have the work rate of 1 bulldozer, we can use it to calculate the time required for 9 bulldozers to clear the same area.

The time required for 9 bulldozers can be calculated using the formula: \[ \text{Time} = \frac{\text{Amount of Work}}{\text{Total Work Rate}} \]

Given: - Total work rate for 9 bulldozers = \( 9 \times 0.0227 \)

\[ \text{Time} = \frac{1}{9 \times 0.0227} \]

\[ \text{Time} \approx 4.63 \text{ hours} \]

Conclusion

It would take approximately 4.63 hours for 9 bulldozers to clear the same area that 7 bulldozers clear in 6.3 hours.