SOLUTION: Jill can fill a pool by carrying buckets of water in 30 minutes. Sue can do the same job in 45 minutes. Tony can do the job in an hour and a half. How quickly can all three fill th

Algebra ->  Customizable Word Problem Solvers  -> Misc -> SOLUTION: Jill can fill a pool by carrying buckets of water in 30 minutes. Sue can do the same job in 45 minutes. Tony can do the job in an hour and a half. How quickly can all three fill th      Log On

Ad: Over 600 Algebra Word Problems at edhelper.com


    

Question 368877: Jill can fill a pool by carrying buckets of water in 30 minutes. Sue can do the same job in 45 minutes. Tony can do the job in an hour and a half. How quickly can all three fill the pool together?
a: 12 minutes
b: 15 minutes
c: 21 minutes
d: 23 minutes
e: 28 minutes
Answer by Fombitz(32388) About Me  (Show Source):
You can put this solution on YOUR website!
Jill's rate: 1%2F30
Sue's rate : 1%2F45
Tony's rate: 1%2F90
.
.
.
All together, their rate is 1%2F30%2B1%2F45%2B1%2F90
Rate*Time=Output
Time=Output/Rate
t=1%2F%281%2F30%2B1%2F45%2B1%2F90%29
t=1%2F%283%2F90%2B2%2F90%2B1%2F90%29
t=1%2F%286%2F90%29
t=90%2F6
highlight%28t=15%29minutes