Convert duration to hoursminutesseconds (or similar) in Rails 3 or Ruby

Convert duration to hours:minutes:seconds (or similar) in Rails 3 or Ruby

See: http://api.rubyonrails.org/classes/ActionView/Helpers/DateHelper.html

distance_of_time_in_words(3600)
=> "about 1 hour"

Ref: https://stackoverflow.com/questions/4175733/convert-duration-to-hoursminutesseconds-or-similar-in-rails-3-or-ruby