An ounce is a unit of mass. A kilometre is a unit of distance. The two units are therefore incompatible.
Kilometers would be the most likely choice.
That would be 41 kilometers
Kilometers
Usually, you would use kilometers.
kilometers
5.68 kilometers = 5,680 meters
7.58 kilometers = 7,580,000 millimeters
2.56 miles is 4.12 kilometers.
Kilometers would be the standard measurement.
I believe that would be 0.18288 Kilometers.
56 kilometers=56,000,000 millimeters
75 kilometers=75,000 meters