SOLUTION: A woman can do a certain job in 10 hr and the younger daughter can do it in 12 hr. After the woman and her younger daughter have been working for 1 hr, the younger daughter got tir

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Question 921691: A woman can do a certain job in 10 hr and the younger daughter can do it in 12 hr. After the woman and her younger daughter have been working for 1 hr, the younger daughter got tired and decided to leave the woman doing the job alone. How long (in hours) did the woman finish the job after the younger daughter left her?

Answer by richwmiller(17219) About Me  (Show Source):
You can put this solution on YOUR website!
It is obvious that the daughter can't do the job alone in 12 hours if she is worn out after one hour!
1/10+1/12+x/10=1
1/12+(x+1)/10=1
1/6+(x+1)/5=2
x=49/6
x=8 1/6
x=8.1667