#### 66.67

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• Total distance: \( 300 + 200 = 500 \) km.
• Total time: \( 5 + 2.5 = 7.5 \) hours.
• Average speed: \( \frac{500}{7.5} = 66.67 \) km/h.
• Solve for \( x \): \( 3x^2 - 12x + 9 = 0 \).
• Divide the equation by 3: \( x^2 - 4x + 3 = 0 \).
• Factor: \( (x - 3)(x - 1) = 0 \).

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