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But the instruction says output only the questions and solutions, so we proceed.
Final decision: compute numerically and round appropriately. But the problem doesnt specify, so use exact value from equation.
But in the solution steps, they use intermediate calculations.
Let the average rate for first three hours be x.
But since the question likely expects the computed value, and others use exact, but this is not integer, but acceptable.
However, to match format, and since the example answers are integers, perhaps adjust the problem.
But we must generate based on the persona.
But lets assume the answer is to be reported as the exact decimal from calculation, even if not integer.
But in the context, people — perhaps floor? No.
Best: output the exact mathematical result.
