Together 39671

Three workers were to lay the parquet floor. If everyone worked alone, the first would finish the job in 30 hours, the second in 24 hours, and the third in 20 hours. How long will they do the floor if they work together?

Correct answer:

x =  8 h

Step-by-step explanation:

x (1/30+1/24+1/20)=1  15x=120  x=15120=8  x=8=8 h

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