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GRE Prep Club Team Member
Joined: 20 Feb 2017
Posts: 2506
Given Kudos: 1055
GPA: 3.39
At 8am on Thursday, two workers, A and B, each start working independe
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04 Apr 2021, 22:36
04 Apr 2021, 22:36
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Question Stats:
34% (03:40) correct
65% (03:33) wrong based on 26 sessions
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At 8am on Thursday, two workers, A and B, each start working independently to build identical decorative lamps. Worker A completes her lamp at 5pm on Friday, while Worker B completes her lamp sometime during the morning on Friday. If both workers adhere to working hours of 8am to 12pm and 1pm to 5pm each day, at which of the following times might the two workers have completed a single lamp had they worked together at their respective constant rates?
A. Thursday, 1:30pm
B. Thursday, 2:15pm
C. Thursday, 3:00pm
D. Thursday, 4:15pm
E. Friday, 12:00pm
A. Thursday, 1:30pm
B. Thursday, 2:15pm
C. Thursday, 3:00pm
D. Thursday, 4:15pm
E. Friday, 12:00pm
Re: At 8am on Thursday, two workers, A and B, each start working independe
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10 Apr 2021, 03:16
10 Apr 2021, 03:16
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Total Time taken when A and B worked together: A∗B/(A+B)
Given A=16hrs
Given B=8 to 12hrs
Maximum time taken =16∗12/(16+12)= 6hr 51mins (option D,E are out)
Minimum time taken =16∗8/(16+8) = 5hr 19Mins (option A,B are out)
Hence Answer C .
Given A=16hrs
Given B=8 to 12hrs
Maximum time taken =16∗12/(16+12)= 6hr 51mins (option D,E are out)
Minimum time taken =16∗8/(16+8) = 5hr 19Mins (option A,B are out)
Hence Answer C .
General Discussion
GRE Prep Club Team Member
Joined: 20 Feb 2017
Posts: 2506
Given Kudos: 1055
GPA: 3.39
Re: At 8am on Thursday, two workers, A and B, each start working independe
[#permalink]
09 Apr 2021, 23:33
09 Apr 2021, 23:33
Expert Reply
+1 Kudos to posts containing answer with explanation
