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Answer:
l=5.1
b=1.7
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perimeter of rect.=x
p of sq = 40m
then, x={(2*40)/5}-2.4
16-2.4
x=13.6
p of rectangle = 13.6
p of rectangle = 2(l+b)
let l be a
then, 2{a+(a/3)} = 13.6
8a/3 = 13.6
a = 13.6*3/8
a = 5.1
Length = a = 5.1m
Breadth = a/3 = 1.7m
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