



 
Hi Miura, First of all express the distance around the block, the perimeter, in meters. Let $W$ be the width of the block in meters. The block is 3 times as long as it is wide so what is its length in terms of $W?$ What is the distance all the way around the block in terms of $W?$ You know this distance so this gives you an equation in $W.$ Solve for $W.$ Penny  


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