How to convert 420 yards to kilometers?
We know (by definition) that:
We can set up a proportion to solve for the number of kilometers.
Now, we cross multiply to solve for our unknown :
Conversion in the opposite direction
The inverse of the conversion factor is that 1 kilometer is equal to 2.60384118651835 times 420 yards.
It can also be expressed as: 420 yards is equal to kilometers.
An approximate numerical result would be: four hundred and twenty yards is about zero point three eight kilometers, or alternatively, a kilometer is about two point six zero times four hundred and twenty yards.
 The precision is 15 significant digits (fourteen digits to the right of the decimal point).Results may contain small errors due to the use of floating point arithmetic.