SOLUTION: Susan can do a certain job in 5 hours. Kim can do the same job in 3 hours. Working together, how many hours would they need to do the job?

SOLUTION: Susan can do a certain job in 5 hours. Kim can do the same job in 3 hours. Working together, how many hours would they need to do the job?

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Question 283311: Susan can do a certain job in 5 hours. Kim can do the same job in 3 hours. Working together, how many hours would they need to do the job?
Answer by richwmiller(17219) (Show Source): You can put this solution on YOUR website!
x/5+x/3=1
3x+5x=15
8x=15
x=15/8
x=1 7/8 hours
x/5=15/8/5=3/8 of the job
x/3=15/8/3=5/8 of the job
Sue does 3/8 and Kim does 5/8 of the job

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