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29 Jul 2019, 06:05
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Question Stats:
89% (01:18) correct
11%
(02:27)
wrong
based on 103
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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 1 ½ 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
A. 12 minutes
B. 15 minutes
C. 21 minutes
D. 23 minutes
E. 28 minutes
blowice27
Joined: 16 Apr 2019
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Concentration: Marketing, Sustainability
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29 Jul 2019, 06:11
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1/30 + 1/45 + 1/90 = 6/90 = 1/15
Ans: 15
1/30 + 1/45 + 1/90 = 6/90 = 1/15
Ans: 15
chetansood
29 Jul 2019, 06:29
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Easiest way to attempt these questions is to remember only add and equate rates.
Ra + Rb + Rc = Rabc
Then use Rate = work / time
Let v b volume of pool
Ra V/30
Rb V/60
Rc V/90
Putting it in above formula
Ra + Rb + Rc = V ( 1/30+ 1/60 + 1/90 )
Rabc = V/15
Rabc = V / Tabc
V/15 = V / Tabc
Tabc = 15 minutes
Posted from my mobile device
Ra + Rb + Rc = Rabc
Then use Rate = work / time
Let v b volume of pool
Ra V/30
Rb V/60
Rc V/90
Putting it in above formula
Ra + Rb + Rc = V ( 1/30+ 1/60 + 1/90 )
Rabc = V/15
Rabc = V / Tabc
V/15 = V / Tabc
Tabc = 15 minutes
Posted from my mobile device
