Question 1150253
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1.  "Trial and error" solution (by guessing) is 4 meters (width) and 10 meters (length) and takes 4 seconds.



2.  Algebra solution is via this equation


        x*(x+6) = 40

        x^2 + 6x - 40 = 0

        (x+10)*(x-4) = 0


    giving the same answer x= 4 meters for the width  and  (x+6) = (4+6) = 10 meters for the length.
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Solved.