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The first tiler would cover the inside of the pool in 5 working days, and the second would need seven working days for the same work.

In how many days would they line the inside of the pool together?

Correct answer:

t =  2.9167 d

Step-by-step explanation:

t1=5 d t2=7 d  t (1/t1+1/t2)=1 t (1/5+1/7)=1  12t=35  t=1235=2.91666667  t=12352.916667=2.9167 d

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