Apartment 71114

A father and son paint the apartment together in 6 hours. My father would paint the apartment in 9 hours. In how many hours would the son paint the apartment himself?

Correct answer:

s =  18 h

Step-by-step explanation:

o=9 h t=6 h  t (s1+o1)=1  1/s + 1/o = 1/t  1+s/o=s/t 1+s/9=s/6  s=18  s=118=18  s=18=18 h



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