Hi

 length exceeds the width by 28 inches.

Let x and (x+28in)represent the width and length respectively

 2(x+28) + 2x = 68in

  4x = 12in 

   x = 3in, the width.  the length is  31in  (3in + 28in)



CHECKING our Answer***

  2*31in + 2*3in =  62in + 6in = 68in



 

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