Together 81046

Two painters are painting the factory fence together. If everyone worked alone, the first would finish the job in 16 days, the second in 20 days. When will they finish the work together?

Correct answer:

t =  8.8889

Step-by-step explanation:

a=16 d b=20 d  d=1/a+1/b=1/16+1/20=809=0.1125  t d = 1  t=1/d=1/0.1125=8.8889

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