Answer: Greg alone will clean the snow in 21 minutes
Explanation:
From the question, Greg + Cindy can clean the snow in 12 minutes
Cindy working alone is able to clear the same quantity of snow in about 28 minutes.
Now, Greg + Cindy ------ 12
Cindy alone ------ 28
we'll simply reduce 28/12 to its lowest term and we should have 7/3
It's very logical that two people can execute a task in less time than just one person as long as all are working at the same rate and in the same conditions.
Let's now take 7 joules as the sum of Greg and Cindy's energy and 3 joules as the quantity of Cindy's energy alone. Greg's supposed quantity of energy should be - (7-3 = 4 joules).
Therefore, Greg's + Cindy's energy/ 7joules of energy can be used to execute a task in 12 minutes. Greg's energy alone/ 4joules of energy can execute a task in ? minutes
7 joules -------- 12 minutes
4 joules -------- ? minutes
= 7/4 × 12 = 21 minutes
This means that Greg is able to clean the snow in 21 minutes
How long would it have taken Greg alone?
If Greg and Cindy cleans the snow in 12 minutes
Then, it would take Cindy 28 minutes to clean it alone.
Therefore, we need to find the amount of time it would take Greg alone to clean the snow.
Let Greg be = x
Let Cindy be = y
x + y = 12 minutes
y= 28 minutes
To find x, we would get 28- 12 = 16 minutes
Therefore, it would take Greg alone 16 minutes to clean the snow from the driveway.
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