Question 1085387
{{{W*(W+0.12) = 0.054 }}}
{{{ W^2 + 0.12W - 0.054 = 0 }}}
Using quadratic formula:
{{{ W= (1/2)*(-0.12 +- sqrt(0.12^2 - 4*1*(-0.054))) }}} 
{{{ W = (1/2) * (-0.12 +- 0.48) }}}
{{{ W = 0.18 }}}  and/or {{{ W = -0.30 }}}

Discard the W<0 answer as it is nonsensical.  

{{{ W = 0.18mi }}} —>  {{{ L = 0.30mi}}}
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Check:   0.18mi * 0.30mi = 0.054mi^2