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Answer:
170cm
Step-by-step explanation:
Given data
perimeter of 600 cm
let the Length be x
L=x
W= x-40
P=2L+2W
600=2(x)+2(x-40)
600=2x+2x-80
600= 4x-80
600+80= 4x
680= 4x
divide both sides by 4
x= 680/4
x=170
Hence the length is 170cm