5000 miles to km - How to Convert Miles to Kilometers: 9 Steps (with Pictures)

That's all there is to it! Current use: It is currently the official unit of measurement for expressing distances between geographical places on land in most of the world.

This changed in 1889, when the International prototype metre was established as the length of a prototype meter bar made of an alloy of 90% platinum and 10% iridium measured at the melting point of ice.

So what is a good Hours to Mileage ratio?.

Air distance is the bird fly distance between two locations which is calculated with the great circle formula.