#!/usr/local/bin/ruby
class Numeric
  def secs_to_minutes
    self / 60
  end
  def minutes_to_hours
    self / 60
  end
end
puts 86400.secs_to_minutes.minutes_to_hours
[download]

Usually what's meant by "pure OO" (which is what I presume the OP meant by "native") is that everything is an object. In Perl (and Java, and C++) there are underlying primitive data types which aren't first class objects in their own right (granted Ruby cheats with small integers under the hood :).

Update: Tidied up wording