They will run 34.27903 kilometer.
What is kilometer?
The kilometer (spelled kilometer in American English) is just a metric unit of length equivalent to one thousand meters.
Conversion of mile into kilometer.
It is known that, 1 mile = 1.60 kilometer.
Then, 21.3 mile = 1.60 × 21.3 = 34.08 kilometer.
Therefore, the correct answer will be 34.08 kilometer.
To know more about kilometer.
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