Question 468261
  <pre><font face = "Tohoma" size = 4 color = "indigo"><b> 
Hi,
<img src="http://upload.wikimedia.org/wikipedia/commons/thumb/d/da/PerimeterRectangle.svg/200px-PerimeterRectangle.svg.png">
length is twice its width
Let x and (2x) represent the width and length respectively.
  Question states***
P = 2*2x + 2x = 60cm 
      6x = 60cm
       x = 10cm, the width.  the length is 20cm

CHECKING our Answer***
 2*10cm + 2*20cm = 60cm