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He meant the logic of solution would not be valid anymore, but still genius as it has 0.5 =)
If the water consumption rate was changed, any method would have to be rewritten. The rate is not provided as a parameter here, thus we have no choice but to perform a calculation based on a constant in the code. I suppose it could be assigned to a variable for ease of changing later, but that is not a requirement of this kata.
if the water consumption rate changes, this method will have to be completely rewritten