Use the formula \(C = 2\pi r\).

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• Calculate the speed: \(300 \text{ miles} / 5 \text{ hours} = 60 \text{ mph}\).
• Time to travel 540 miles: \(540 \text{ miles} / 60 \text{ mph} = 9\) hours.
• A circle has a circumference of 31.4 meters. What is its radius?
• Substitute: \(31.4 = 2 \times 3.14 \times r\).
• Solve for \(r\): \(r = \frac{31.4}{6.28} = 5\) meters.
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