SOLUTION: It takes Ralph 8 hours to paint a fence alone. Lisa can do the same job in 11 hours. If Ralph paints alone for 35 minutes before Lisa begins helping, how long must they work toget
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Question 950277: It takes Ralph 8 hours to paint a fence alone. Lisa can do the same job in 11 hours. If Ralph paints alone for 35 minutes before Lisa begins helping, how long must they work together to finish painting the fence? Give your answer as a simplified fraction.
Answer by josmiceli(19441) (Show Source): You can put this solution on YOUR website!
Ralph's rate of painting is:
( 1 fence ) / ( 8 hrs )
min = hrs
----------------------------------
In min, Ralph paints:
fraction of the fence
That means there is
of the fence left to paint
----------------------
Add their rates of painting to get rate painting together
Let = time in hrs for them to paint
the fence working together
Multiply both sides by
hrs
---------------------
Doesn't seem right if they mention "simplified"
I think my method is right, though -check the
math & get another opinion, too
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