A decimal is a way of representing a number in such a way that the place value of each digit is ten times that of the digit to its right. It is an abstract concept and has no length. Therefore the question makes no sense.
An alternative meaning for a decimal is a measure of area. However, the most basic rules of dimensional analysis state that conversion between measures with different dimensions (decimal = squared lengths, and kilometre = length) is not valid.
Finally, if it is decaimls that you are interested in then I regret there is no answer because there is no such word.
.23
Incredibly close to 31.8
U have to use deciamls
405.3
When their fractional parts are the same.
1.3 mi = 2.092 km
0.001
Not necessarily. If the decimal terminates, or if it repeats periodically, then it is rational.
On average, the distance is 500 km, depending on where in Pennsylvania you go to.
Around 35 km/h
13.245033112582781
One mile is equivalent to approximately 1.609 kilometers.