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0.36 \times x + 0.72 \times \sqrt{2500+(100-x)^2}
x = 100 - \frac{50}{\sqrt{3}} \approx 71.132487
\approx 67.1769s
0.36 \times x + 0.72 \times \sqrt{2500+(100-x)^2}forx = 100 - \frac{50}{\sqrt{3}} \approx 71.132487is\approx 67.1769s.