Together m+d

Aunt Jane would paint her apartment in 10 hours, her mother in 15 hours. How much do they paint it for together?

Correct answer:

t =  6 h

Step-by-step explanation:

t1=10 h t2=15 h  t (1/t1+1/t2)=1 t (1/10+1/15)=1  5t=30  t=6=6 h

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