In a two-medium travel scenario modeled by a differentiable total time function

MATHEMATICS · Subjective · AP · Calculus AB · Analytical Applications of Differentiation · Analytical Applications of Differentiation

Problem

In a two-medium travel scenario modeled by a differentiable total time function T(x)T(x), what is the practical meaning of the value of xx that satisfies T′(x)=0T'(x)=0 and T′′(x)>0T''(x)>0? Provide your answer in one concise sentence.

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