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03 Nov 2023, 01:30
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A
Be sure to select an answer first to save it in the Error Log before revealing the correct answer (OA)!
Difficulty:
25%
(medium)
Question Stats:
76% (01:24) correct
24%
(01:19)
wrong
based on 93
sessions
History
Date
Time
Result
Not Attempted Yet
Working together, Joe and Joanne finish a job in 2 hours. How long will it take Jeremy and Joe to finish the job?
(1) Working alone and without breaks Joe takes 5 hours to finish the job, which is 400% as long as the time it takes Jeremy to finish the job.
(2) Working alone and without breaks Joanne takes 10 hours to finish 3 times the job.
(1) Working alone and without breaks Joe takes 5 hours to finish the job, which is 400% as long as the time it takes Jeremy to finish the job.
(2) Working alone and without breaks Joanne takes 10 hours to finish 3 times the job.
04 Nov 2023, 10:52
Kudos
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Assume that Joe, Joanne, and Jeremy spend A, B, and C hours to complete the job, respectively.
Working together, Joe and Joanne finish a job in 2 hours. --> 1/A + 1/B = 1/2 (*)
How long will it take Jeremy and Joe to finish the job? --> We want to know 1/C + 1/A
(1) --> A = 5, C = 5/400% --> Now A and C are known. --> 1/C + 1/A is known. --> Sufficient.
(2) --> B = 10/3 --> A is known from (*) . Yet, C is still unknown. --> Insufficient.
Thus, A.
Working together, Joe and Joanne finish a job in 2 hours. --> 1/A + 1/B = 1/2 (*)
How long will it take Jeremy and Joe to finish the job? --> We want to know 1/C + 1/A
(1) --> A = 5, C = 5/400% --> Now A and C are known. --> 1/C + 1/A is known. --> Sufficient.
(2) --> B = 10/3 --> A is known from (*) . Yet, C is still unknown. --> Insufficient.
Thus, A.
04 Nov 2023, 11:02
Kudos
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Bunuel
OA is A
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