A fraction is a way to describe a part of a whole. The time it will take for the helper to do the job is 20 minutes.
A fraction is a way to describe a part of a whole. such as the fraction ¼ can be described as 0.25.
Given that the gardener can care for the Green's property in 5 hours. Therefore, the rate at which the gardener can care is,
Rate of gardener = 1/5
Also, If the gardener helper assists him, they can complete the job in 4 hours. Therefore, the rate at which the gardener and helper can care is,
Rate of gardener and helper = 1/4
Further, the rate at which the helper can care is,
Rate of helper = 1/x
Now, the sum of the two rates can be written as,
1/5 + 1/x = 1/4
(x+5)/5x = 1/4
4x + 20 = 5x
x = 20
Hence, the time it will take for the helper to do the job is 20 minutes.
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