Displaying the difference between times in Ruby (See related posts)

require 'time'

def seconds_fraction_to_time(seconds)
  hours = mins = 0
  if seconds >=  60 then
    mins = (seconds / 60).to_i 
    seconds = (seconds % 60 ).to_i

    if mins >= 60 then
      hours = (mins / 60).to_i 
      mins = (mins % 60).to_i
    end
  end
  [hours,mins,seconds]
end

departed_house = Time.parse("07:34")
arrived_at_supermarket = Time.parse("09:10")
travel_duration_in_seconds =  arrived_at_supermarket - departed_house

hours, minutes, seconds = seconds_fraction_to_time(travel_duration_in_seconds)

puts "The journey from my home to the supermarket took #{hours} hour(s), #{minutes} minutes, and #{seconds} seconds."