A runner completes a 50 K (50-kilometer) ultramarathon. How many miles did the runner race
The correct answer and explanation is:
Correct Answer:
The runner raced approximately 31.07 miles.
Explanation (300 words):
To convert kilometers (km) to miles, you use the conversion factor:
1 kilometer ≈ 0.621371 miles
The runner completed a 50-kilometer ultramarathon, so we apply the conversion: 50 km×0.621371 miles/km=31.06855 miles50 \text{ km} \times 0.621371 \text{ miles/km} = 31.06855 \text{ miles}
Rounded to two decimal places, this becomes 31.07 miles.
Why This Conversion Is Important:
Distances in athletics are often measured differently depending on the country. Most countries use the metric system, where distances are in kilometers. However, countries like the United States still commonly use the imperial system, where distances are in miles. Therefore, converting between these units is crucial for understanding and comparing race lengths internationally.
For example, if a runner from the U.S. is told they are going to run a 50K, they may better understand the challenge if they think of it as just over 31 miles, since the standard marathon (26.2 miles) is a common benchmark in the U.S.
Ultramarathon Context:
A 50K ultramarathon is a race that goes beyond the standard marathon distance (42.195 kilometers or 26.2 miles). It is considered the shortest standard ultramarathon distance, but still presents a significant endurance challenge. These races are typically held on trails or rugged terrain, adding to their difficulty.
So, when someone says they ran a 50K, it means they covered around 31.07 miles, which is nearly 5 miles more than a traditional marathon. This highlights the runner’s advanced endurance capability and commitment to long-distance running.