To convert 81 kilometers to miles, you can use the following steps:
1. Use the conversion factor 1 kilometer = 0.621371 miles.
2. Multiply the number of kilometers by the conversion factor to get the equivalent number of miles.
So, to convert 81 kilometers to miles:
81 km * 0.621371 miles/km = 50.331651 miles
Therefore, 81 kilometers is equal to approximately 50.33 miles.
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