Question 281427
Let x = width
Then 3x - 2 = length.

We need 2 widths, and 2 lengths, for a perimeter of 6800cm (1m=100cm)

{{{2x + 2(3x - 2) = 6800}}}

{{{2x + 6x - 4 = 6800}}}

{{{8x = 6804}}}

x (width)=850.5
(length) = 2549.5

Proof:  850.5 + 850.5 + 2549.5 + 2549.5 = 6800.