irb(main):019:0> s = 15682
=> 15682
irb(main):020:0> m = s / 60
=> 261
irb(main):021:0> s = s % 60
=> 22
irb(main):022:0> h = m / 60
=> 4
irb(main):023:0> m = m % 60
=> 21