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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...Question
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 1.5 hours. How quickly can all three fill the pool together?
A.12 minutes
B.15 minutes
C.21 minutes
D.23 minutes
E.28 minutes
I got 53 minutes, but there was no answer.
A.12 minutes
B.15 minutes
C.21 minutes
D.23 minutes
E.28 minutes
I got 53 minutes, but there was no answer.
Answers
bobpursley
In 1.5 hours,
Tony can do one pool
Sue can do 2 pools
Jim can do 3 pools
pools=rate*time
combined rate=6pools/1.5 hrs=4pools/hr
time=pools/rate= 1pool/(4pools/hr)=1/4 hr= 15 min
Tony can do one pool
Sue can do 2 pools
Jim can do 3 pools
pools=rate*time
combined rate=6pools/1.5 hrs=4pools/hr
time=pools/rate= 1pool/(4pools/hr)=1/4 hr= 15 min