Answer:
0.3 km
Step-by-step explanation:
Let width be x, then the length = 3x.
Perimeter of the rectangular = 2(length + width)
Perimeter of the rectangular = 2(3x + x)
0.8 = 2(4x)
0.8 = 8x Divide both sides by 8
x = 0.8 / 8
x = 0.1 km.
Therefore, the length is 3x
= 3 × 0.1
= 0.3 km
