Question

Бабушка копала 1/3 огорода 8 часов, дед копал 1/3 огорода 12 часов сколько они будут копать оставшуюся 1/3 вместе?ответ 288 мин

Answer 1

"бабушка копала 1/3 огорода 8 часов"

Сколько копать она будет в час? 1/3:8=1/24 в час.

"дед копал 1/3 огорода 12 часов"

Сколько копать она будет в час? 1/3:12=1/36 в час.

Какова их скорость вместе? 1/24+1/36=5/72 огорода в час.

"сколько они будут копать оставшуюся 1/3 вместе?"

(1/3):(5/72)=72/15=4,8 часов=288 минут

Answer 2

To find out how long it will take for them to finish the remaining 1/3 of the garden together, we can first calculate the individual rates at which they work based on the information given.

Let's assume that the rate at which the grandmother works is "Rg" (fraction of the garden per hour), and the rate at which the grandfather works is "Rd" (fraction of the garden per hour).

The grandmother dug 1/3 of the garden in 8 hours, so her rate is: Rg = 1/3 / 8 = 1/24 of the garden per hour.

The grandfather dug 1/3 of the garden in 12 hours, so his rate is: Rd = 1/3 / 12 = 1/36 of the garden per hour.

Now, to find the combined rate when they work together, we add their individual rates: R_combined = Rg + Rd = 1/24 + 1/36 = (3 + 2) / 72 = 5/72 of the garden per hour.

Finally, to calculate the time it takes for them to finish the remaining 1/3 of the garden together, we use the formula: Time = (Remaining fraction of the garden) / (Combined rate) Time = 1/3 / (5/72) Time = 1/3 * (72/5) Time = 24/5 = 4.8 hours.

To convert this time into minutes, we multiply by 60: 4.8 hours * 60 minutes/hour = 288 minutes.

So, the correct answer is 288 minutes, not 4.8 hours.