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

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(39620) (Show Source): You can put this solution on YOUR website!
Ralph
Lisa
Both 1/8+1/12=3/24+2/24=

t, how much time in hours working together.

RT=J accounting for the job.
10 minutes is hour.

Solve for t.
Answer by MathTherapy(10552) (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: hours
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