Let the breadth of the rectangle = x metres.
According to the question,
Length of the rectangle = 2x metres
Perimeter of a rectangle = 2 (length + breadth)
So, 2 (2x + x) = 228
⇒ 2 (3x) = 228
⇒ 6x = 228
Dividing both sides by 6, we get
⇒ 6x/6 = 228/6
⇒ x = 38
So, the breadth of the rectangle = x = 38 metres,
The length of the rectangle = 2x = 2(38) = 76 metres.