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posted by vinci Tuesday, July 16, 2013 at 7:02pm.
If A can do a job in 6 days that V can do in 5 1/2 days and C can do in 2 1/5 days, how long would the job take if A,B, and C were working together?
1/(1/6+1/5.5+1/2.2) =1.245 DAYS
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