Question 390590
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Hi,         
Let x and (2x +42cm)represent the width and length respectively
<img src="http://upload.wikimedia.org/wikipedia/commons/thumb/d/da/PerimeterRectangle.svg/200px-PerimeterRectangle.svg.png">
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