In this challenge, you have to implement a function that returns the given distance kilometers converted into miles. You have to round the result up to the fifth decimal digit.
km_to_miles(2) ➞ 1.24274
km_to_miles(6) ➞ 3.72823
km_to_miles(8) ➞ 4.97097
1 kilometer = 0.621371 miles.