Question

Миша вскапывает грядку за 10 мин саша за 12 мин олег за 15 мин за сколько они вскапают её втроем

Answer 1

(10+12+15):3=12,3
Вроде бы так.

Answer 2

To find out how long it will take for all three of them to dig the bed together, we need to calculate their combined work rate. The work rate is inversely proportional to the time taken.

Let's find the work rates for each person first:

1. Misha's work rate = 1 bed / 10 minutes = 1/10 bed per minute
2. Sasha's work rate = 1 bed / 12 minutes = 1/12 bed per minute
3. Oleg's work rate = 1 bed / 15 minutes = 1/15 bed per minute

Now, to find their combined work rate, we add their individual work rates:

Combined work rate = Misha's work rate + Sasha's work rate + Oleg's work rate Combined work rate = 1/10 + 1/12 + 1/15

To add these fractions, we need to find a common denominator, which is 60. Now, let's convert the fractions:

Combined work rate = (6/60) + (5/60) + (4/60) Combined work rate = 15/60

Now, we can find the time taken for all three of them to dig the bed together using the combined work rate:

Time taken = 1 / Combined work rate Time taken = 1 / (15/60) Time taken = 60 / 15 Time taken = 4 minutes

So, Misha, Sasha, and Oleg will dig the bed together in 4 minutes.