Question 1113231
<pre>
Time for Sam              2x
Time for Dean              x
Time both combined        1.5
</pre>

{{{1/(2x)+1/x=1/1.5}}}


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{{{1/(2x)+2/(2x)=2/3}}}

{{{3/(2x)=2/3}}}

{{{2x/3=3/2}}}

{{{x=9/4}}}

{{{highlight(x=2&1/4)}}}--------time in hours for Dean to dig the hole alone.