SOLUTION: how do you convert 5km in us metrics? What is the metric system for the European system? The U. S is very confusing to grasp, at least it is for me.

We must know that:

, with possible unit fractions ,

, with possible unit fractions ,

, with possible unit fractions ,

, with possible unit fractions ,

5280ft = 1mi, with possible unit fractions ,

We start by putting  over :



Then we multiply by the unit fraction with 
in the denominator, so it will cancel with the 
in the numerator, so we now we have:



so that the 's will cancel:



Then we multiply by the unit fraction with 
in the denominator, so it will cancel with the 
in the numerator, so now we have:



and after canceling:





Then we multiply by the unit fraction with 
in the denominator, so it will cancel with the 
in the numerator, so now we have:



and after cancelling:




Then we multiply by the unit fraction with 
in the denominator, so it will cancel with the 
in the numerator, so now we have:



and after canceling:



Then we multiply by the unit fraction with 
in the denominator, so it will cancel with the 
in the numerator, so now we have:



and after canceling:



Putting together everything that hasn't been canceled:







Or just a tiny bit over 3.1 miles.

Edwin