
Converter class that can currenly
  be used to convert a double-valued speed in mi/hr to
  a double-valued speed in km/hr. You must now modify
  this class.
  
      The system must satisfy the following physical requirements:
      
PR-1
      All constants must be public static final class constants
      (i.e., must be accessible outside of the class, 
      must not be declared in a function/method, and it must not be possible
      to change them after they are initialized).
      
      The system must satisfy the following operational requirements:
      
OR-1
      The class must contain an int-valued constant
      named FEET_PER_MILE that is assigned the value
      5280.
      
OR-2
      The class must contain a "function" named toMiles() 
      that is passed an int-valued distance (in ft) 
      and returns the equivalent double-valued distance (in mi).
      
Copyright 2013