Hi,         

Let x and (2x +42cm)represent the width and length respectively



Question States***

 2(2x+42cm) + 2x = 606m

Solving for x

 4x + 84cm +2x = 606cm

         6x = 522cm

          x = 87cm, the width.  Length is 216cm.    (2*87cm +42cm)



CHECKING our Answer***

  2*87cm + 2*216cm = 606m 

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