Two iron wires of the same length, one is divided into three sections according to 3:4:5, and the other is divided into three sections according to 7:9:11, how many different lengths of the divided iron wires are there?
两根同样长的铁丝，一根按3：4：5分成三段，另一根按7：9：11分成3段，那么分成的铁丝有多少种不同的长度．
<result>5</result>