Question 1140424
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Mike Mulligan and His Steam Shovel by Virginia Lee Burton, Mike Mulligan can dig a cellar in just one day with his steam shovel Mary Anne. 
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WHAT?


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A diesel-powered excavator can dig the same hole in half a day. How long would it take to dig the hole if both machines worked together?
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Maybe this all means that the first, whatever can do the job alone in 1 day, and the "diesel excavator" can do the job alone in {{{1/2}}} day.


Answer expression for the question:

{{{1/(1/1+1/(1/2))}}}{{{days}}}


Simplify that.