Convert 18 kilometers to miles (to the nearest tenth).
The Correct Answer and Explanation is:
To convert kilometers to miles, we use the conversion factor that 1 kilometer is approximately equal to 0.621371 miles. To convert 18 kilometers to miles, we can use the formula:
[
\text{Miles} = \text{Kilometers} \times 0.621371
]
Substituting in the value:
[
\text{Miles} = 18 \, \text{kilometers} \times 0.621371 \, \text{miles/kilometer}
]
Calculating this gives:
[
\text{Miles} = 18 \times 0.621371 \approx 11.185 \, \text{miles}
]
Rounding this to the nearest tenth results in approximately 11.2 miles.
Explanation
The need for converting kilometers to miles arises from the differences in measurement systems used worldwide. The metric system, which includes kilometers, is widely used globally, while the imperial system, which includes miles, is primarily used in the United States. Knowing how to convert between these units is essential for various practical applications, such as travel planning and understanding distances on maps.
The conversion factor of 0.621371 is derived from the fact that one mile is equal to 1.60934 kilometers. Therefore, to convert kilometers to miles, you multiply the number of kilometers by this factor. Conversely, to convert miles to kilometers, you would divide the number of miles by the same factor.
For example, if someone is traveling in a country that uses kilometers and wants to know how far they have traveled in miles, they can apply this conversion method. Additionally, various online calculators and mobile applications can simplify this process, making it accessible for those unfamiliar with unit conversions.
In summary, converting 18 kilometers to miles results in approximately 11.2 miles, emphasizing the importance of understanding these conversions for effective communication and travel planning in different regions.