To find the missing value for 20 kilometers in miles, we can use the conversion factors provided.
The conversion from kilometers to miles typically uses the factor: 1 kilometer ≈ 0.621371 miles
Using this factor, we can convert kilometers into miles.
For 20 kilometers: \[ 20 \times 0.621371 \approx 12.4274 \]
Looking at the provided answer options: 6, 5.4, 11.1, and 12, the closest reasonable approximation to 12.4274 is 12.
So, the missing value in the table is 12 miles for 20 kilometers.