Asked by Anonymous

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?
Answered by Ms. Sue
See <b>Related Questions</b> below.
Answered by Reiny
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

Answered by Anonymous
Im still not sure how you are geting the (3pool+2pool+pool) where are those numbers coming from?
Answered by Ms. Sue
Jim can fill 3 pools in 90 minutes; Sue fills 2 pools in 90 minutes . . .
Answered by Anonymous
oh wow thank you so much i totally understand now
Answered by Ms. Sue
You're very welcome.