Ruby: Exercise in converting different units of time

quiz.rb

# Write a program that tells you the following:
#
# Hours in a year. How many hours are in a year?
# Minutes in a decade. How many minutes are in a decade?
# Your age in seconds. How many seconds old are you?
#
# Define at least the following methods to accomplish these tasks:
#
# seconds_in_minutes(1)
# minutes_in_hours(1)
# hours_in_days(1)
# days_in_weeks(1)
# weeks_in_years(1)
#
# Hours in a year. How many hours are in a year?
# Minutes in a decade. How many minutes are in a decade?
# Your age in seconds. How many seconds old are you?
#
# If I am 1,111 million seconds old, how old am I?

#   Define an age_from_seconds method
def seconds_in_minutes(minutes)
  minutes * 60
end

# minutes_in_hours(1)
def minutes_in_hours(hours)
  hours * 60
end

# hours_in_days(1)
def hours_in_days(days)
  days * 24
end

# days_in_weeks(1)
def days_in_weeks(weeks)
  weeks * 7
end

# Added a days_in_years since this doesn't flow down nicely from days_in_weeks and weeks_in_years
def days_in_years(years)
  years * 365
end

# weeks_in_years(1)
def weeks_in_years(years)
  years * 52
end

# Added in years_in_decades - for fun
def years_in_decades(decades)
  decades * 10
end

# Hours in a year. How many hours are in a year?
puts "Hours in a year: " + hours_in_days(days_in_years(1)).to_s

# Minutes in a decade. How many minutes are in a decade?
puts "Minutes in a decade: " + minutes_in_hours(hours_in_days(days_in_years(years_in_decades(1)))).to_s

# Your age in seconds. How many seconds old are you?
puts "My age (25 years) in seconds: " + seconds_in_minutes(minutes_in_hours(hours_in_days(days_in_years(25)))).to_s

#
# If I am 1,111 million seconds old, how old am I?
#   Define an age_from_seconds method
def age_from_seconds(seconds)
  years = seconds / 60 / 60 / 24 / 365
  days = seconds / 60 / 60 / 24 % 365
  hours = seconds / 60 / 60 % 24
  minutes = seconds / 60 % 60
  display_seconds = seconds % 60

  puts "Years: #{years}"
  puts "Days: #{days}"
  puts "Hours: #{hours}"
  puts "Minutes: #{minutes}"
  puts "Seconds: #{display_seconds}"
end

age_from_seconds(1111000000)