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GRE Prep Club Team Member
Joined: 20 Feb 2017
Posts: 2508
Given Kudos: 1053
GPA: 3.39
Working alone at its own constant rate, a machine seals k cartons in 8
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24 Sep 2022, 06:27
24 Sep 2022, 06:27
1
Expert Reply
00:00
Question Stats:
66% (00:54) correct
33% (03:08) wrong based on 3 sessions
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Working alone at its own constant rate, a machine seals k cartons in 8 hours, and working alone at its own constant rate, a second machine seals k cartons in 4 hours. If the two machines, each working at its own constant rate and for the same period of time, together sealed a certain number of cartons, what percent of the cartons were sealed by the machine working at the faster rate?
A. \(25\%\)
B. \(33\frac{1}{3}\%\)
C. \(50\%\)
D. \(66\frac{2}{3}\%\)
E. \(75\%\)
A. \(25\%\)
B. \(33\frac{1}{3}\%\)
C. \(50\%\)
D. \(66\frac{2}{3}\%\)
E. \(75\%\)
Re: Working alone at its own constant rate, a machine seals k cartons in 8
[#permalink]
28 Sep 2022, 06:59
28 Sep 2022, 06:59
1
Expert Reply
No need for lengthy calculations: since the second one works twice as fast as the first, working together second will do 2/3 of the job (their ratio 1/2).
Answer: D.
Answer: D.
gmatclubot
Re: Working alone at its own constant rate, a machine seals k cartons in 8 [#permalink]
28 Sep 2022, 06:59
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