タイムスタンプの間の経過分数をもとめる
$ ruby -rtime -e 'p ["12:34:56","13:42:34","15:16:17","16:10:05"].map{Time.parse(_1)}.each_cons(2).map{|a,b| "%.1f"%((b-a)/60)}'
["67.6", "93.7", "53.8"]
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