Posted by **Anonymous** on Thursday, June 28, 2012 at 5:10pm.

Jim can fill a pool in 30 min, sue can do it in 45 min, Tony can do it in 90min, how long would it take all three to fill the pool together? How would i figure this out?

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**Ms. Sue**, Thursday, June 28, 2012 at 5:14pm
See **Related Questions** below.

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**Reiny**, Thursday, June 28, 2012 at 5:18pm
Jim's rate = pool/30

Sue's rate = pool/45

Tony'rate = pool/90

combined rate = pool/30 + pool/45 + pool/90

= (3pool + 2pool + pool)/90 = 6pool/90

= 2pool/30

time to fill pool with combined rate

= pool/(2pool/30)

= 1/(2/30)

= 15

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**Anonymous**, Thursday, June 28, 2012 at 6:00pm
Im still not sure how you are geting the (3pool+2pool+pool) where are those numbers coming from?

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**Ms. Sue**, Thursday, June 28, 2012 at 6:03pm
Jim can fill 3 pools in 90 minutes; Sue fills 2 pools in 90 minutes . . .

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**Anonymous**, Thursday, June 28, 2012 at 6:05pm
oh wow thank you so much i totally understand now

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**Ms. Sue**, Thursday, June 28, 2012 at 6:11pm
You're very welcome.

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