How long to take 2 men to cut a cord of wood?

It takes man A 6hrs to cut a cord of wood and man B 5hrs to cut a cord of wood. How long would it take them if they both were hired to cut a cord of wood?
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1 Answer

rate1=1/6=0.16666666666..

rate2=1/5=0.2

rate1+rate2=0.666666666...

1/rate=2.727272727272...

or bout 2.7 ours
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