SOLUTION: A homeowner estimates that it will take 9 days to roof his house. A professional roofer estimates that he could roof the house in 5 days. How long will it take if the homeowner hel

Question 1095245: A homeowner estimates that it will take 9 days to roof his house. A professional roofer estimates that he could roof the house in 5 days. How long will it take if the homeowner helps the roofer?
Found 2 solutions by richwmiller, josgarithmetic:
Answer by richwmiller(17219) (Show Source): You can put this solution on YOUR website!
Considering that the non professional homeowner will slow down the pro and ruin material to boot. I would guess at least double the time. So I'll say 10 days plus weekends. So two full weeks at least.
Answer by josgarithmetic(39620) (Show Source): You can put this solution on YOUR website!
Only if the combined rates are truly additive,...

, rate unit being JOBs per DAY
-

; just a little more than 3 days.
RELATED QUESTIONS
A homeowner estimates that it will take him 13 days to roof his house. A professional... (answered by checkley79)
A homeowner estimates that it will take him 8 days to roof his house. A professional... (answered by josmiceli)
a homeowner estimates that it will take her 9 days to roof her house. A professional... (answered by HyperBrain,Alan3354)
A homeowner estimates that it will take her 9 days to roof her house. A professional... (answered by Alan3354)
A homeowner estimates that it will take her 7 days to roof her house. A professional... (answered by richwmiller)
A homeowner estimates that it will take her 7 days to roof her house. A professional... (answered by josgarithmetic)
If one professional roofer can roof and house in six days and another roofer can do it in (answered by ptaylor)
one roofer can put a new roof on a house three times faster than another. Working... (answered by chosenpoint)
one roofer can put a new roof on a house three times faster than another. Working... (answered by edjones)