Question 987068
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1) For L=length: L=2b+3
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2) P=perimeter; 
{{{P=2(L+b)}}}
{{{P/2=L+b}}}
{{{P/2=(2b+3)+b}}} 
{{{P/2=3b+3}}}
{{{216/2=3b+3}}}
{{{108=3b+3}}}
{{{105=3b}}}
{{{35=b}}} The breadth is 35 meters.
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{{{L=2b+3}}}
{{{L=2(35)+3}}}
{{{L=73meters}}}
ANSWER: The length of the rectangle is 73 meters.