Using the together rate, it is found that it will take 18 hours for Erick to build the garden box himself.
<h3>What is the together rate?</h3>
The together rate is given by the sum of each separate rate.
In this problem, the rates are given as follows:
Hence:


x = 18.
Hence, it will take 18 hours for Erick to build the garden box himself.
More can be learned about the together rate at brainly.com/question/25159431
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<h3><u><em>Answer: The answer is 15</em></u></h3><h3><em><u /></em></h3><h3><em><u /></em></h3><h3><u><em>Step-by-step explanation:</em></u></h3>
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_________X=30____
_________-________
Answer:
Solve for x
Multiply in cross
distributive property right side
subtract 3x both sides
Adds 28 both sides
Divide by 4 both sides and rewrite
Step-by-step explanation: