SOLUTION: Working alone, Elisa can dig a 10 ft by 10 ft hole in nine hours. One day her friend Castel helped her and it only took 4.74 hours. Find how long it would take Castel to do it alon

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Question 1122721: Working alone, Elisa can dig a 10 ft by 10 ft hole in nine hours. One day her friend Castel helped her and it only took 4.74 hours. Find how long it would take Castel to do it alone. (Round your answer to the nearest hundredth)?
Found 2 solutions by Boreal, josgarithmetic:
Answer by Boreal(15235) About Me  (Show Source):
You can put this solution on YOUR website!
In 1 hour she does 1/9 of the whole
C does 1/x of the hole in 1 hour
completion takes 4.74 hours
4.74/9+4.74/x=1, where 1 is the entire project
multiply by 9x
4.74x+42.66=9x
4.26x=42.66
It takes Castel 10.01 hours to dig it alone.
in 1 hour approximately 0.11+0.1 or 0.21 of the hole. In 4.74 hours, 100%.

Answer by josgarithmetic(39616) About Me  (Show Source):
You can put this solution on YOUR website!
1 job is DIG A 100 SQUARE FOOT HOLE

RATES
Elisa, 1%2F9
Castel, 1%2Fx
Combined, 1%2F4.74

highlight_green%281%2F9%2B1%2Fx=1%2F4.74%29