A person will run approximately 12.4 miles during a 20 kilometer race. To convert kilometers to miles, you can use the conversion factor that 1 kilometer is equal to 0.62 miles. If you multiply the number of kilometers in the race (20) by this conversion factor, you will get the number of miles in the race:
20 km * 0.62 miles/km = <<20*0.62=12.4>>12.4 miles
So, a person will run approximately 12.4 miles during a 20 kilometer race.
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