SOLUTION: It takes Ralph 8 hours to paint a fence alone. Lisa can do the same job in 12 hours. If Ralph paints alone for 10 minutes before Lisa begins helping, how long must they work toget

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Question 951433: It takes Ralph 8 hours to paint a fence alone. Lisa can do the same job in 12 hours. If Ralph paints alone for 10 minutes before Lisa begins helping, how long must they work together to finish painting the fence? Give your answer as a simplified fraction.
Found 2 solutions by josgarithmetic, MathTherapy:
Answer by josgarithmetic(39618) About Me  (Show Source):
You can put this solution on YOUR website!
Ralph 1%2F8
Lisa 1%2F12
Both 1/8+1/12=3/24+2/24=5%2F24

t, how much time in hours working together.

RT=J accounting for the job.
10 minutes is 1%2F6 hour.

%281%2F8%29%2A%281%2F6%29%2B%285%2F24%29t=1
Solve for t.

Answer by MathTherapy(10552) About Me  (Show Source):
You can put this solution on YOUR website!

It takes Ralph 8 hours to paint a fence alone. Lisa can do the same job in 12 hours. If Ralph paints alone for 10 minutes before Lisa begins helping, how long must they work together to finish painting the fence? Give your answer as a simplified fraction. 
Time taken for both to complete painting: highlight_green%2847%2F10%29 hours