Jasmin - It is a tricky question, but very simple if we stick with the basics. Here is how we can approach:
Step - 1: - Let us eliminate the power 2/3 so raise both sides of the equation to the power 3/2. Once we do that we get:
x - 4 = (100) 3/2
Let S = Shane and K = Kori
S = 52 Hours when working alone
S and K Together = 39 Hours
K = ?
S and K Together = SK/(S+K) <-- Formula (We have reasoning to explain it based on on work rate concept!)
39 = 52K/(52 +K)
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