At the equator,Earth spins at a rate of about 1670 kilometers per hour. The circumference of Earth at the equator is about 40 ,000 kilometers. About how long does it take Earth to make one complete rotation on its axis at the equator? A. 12 hours B. 29.5 days C. 24 hours D. 365 days

To determine how long it takes Earth to make one complete rotation on its axis at the equator, we can use the formula:<br /><br />\[ \text{Time} = \frac{\text{Circumference}}{\text{Speed}} \]<br /><br />Given:<br />- Circumference of Earth at the equator = 40,000 kilometers<br />- Speed of Earth's rotation at the equator = 1670 kilometers per hour<br /><br />Plug these values into the formula:<br /><br />\[ \text{Time} = \frac{40,000 \text{ km}}{1670 \text{ km/h}} \approx 23.95 \text{ hours} \]<br /><br />This is approximately 24 hours.<br /><br />Therefore, the correct answer is:<br /><br />C. 24 hours