Answer:
length is 5 meters. width is 1 meter.
Step-by-step explanation:
Perimeter of a rectangle = 2 ( length + width )
Let x be our width
12 = 2 ( 3 + 2x ) + 2x
12 = 6 + 4x + 2x
12 - 6 = 4x + 2x
6 = 6x
x = 1
Therefore, the value of our length ( 3 + 2x ) is 5