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

Question

I have a feeling there is a simple/built-in way to do this but I can\'t find it.

I have a duration (in seconds) in an integer and I want to display it in a friendly form

Answer 1

    hours = 3.5456
    value = (hours*60).divmod(60).map{ |a| "%02d"%[a.floor] }.join(":")
    => "03:32"