SOLUTION: Jim can fill a pool carrying buckets of water in 30 minutes. Sue can do the same job in 45 minutes. Tony can do the same job in 1 ½ hours. How quickly can all three fill the pool t

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Question 167533: Jim can fill a pool carrying buckets of water in 30 minutes. Sue can do the same job in 45 minutes. Tony can do the same job in 1 ½ hours. How quickly can all three fill the pool together?
I dont know how to do this type of problem. Is there a formula? How would you solve the one above?
Answer by Mathtut(3670) About Me  (Show Source):
You can put this solution on YOUR website!
Jim works at a rate of 1/30 of job per minute
Sue works at a rate of 1/45 of job per minute
Tony works at a rate of 1/90 of job per minute
now the are doing the job together
%281%2F30%29t%2B%281%2F45%29t%2B%281%2F90%29t=1 multiply equation by 90
3t%2B2t%2Bt=90--->6t=90 highlight%28t=15%29minutes for all of them to do the job