Question 53904
Rectangles are four sided figures with opposite sides that are equal.  Perimeter is the sum of the sides (add all the sides).  So the perimeter of a rectangle is:
Perimeter(P)=length(L)+lenght(L)+width(W)+width(W)
P=L+L+W+W
P=2L+2W
Let the width=x
Then length is 2 less than (-2) 3 times (3*)the width(x)=3x-2
P=68 km (This is a BIG rectangle.)
Plug them into your formula and solve for x:
68=2(3x-2)+2(x)
68=6x-4+2x
68=(6+2)x-4
68=8x-4
68+4=8x-4+4
72=8x
{{{72/8=8x/8}}}
{{{9=cross(8)x/cross(8)}}}
9=x
The width:x=9km
The length:3x-2=3(9)-2=27-2=25km
Happy Calculating!!!