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17 Apr 2017, 01:13
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C
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:
75% (02:10) correct
25%
(02:21)
wrong
based on 208
sessions
History
Date
Time
Result
Not Attempted Yet
Jed can stuff 7 envelopes per minute. Ed can stuff 3 envelopes per minute. Fred can stuff 5 envelopes per minute. If Jed and Ed team up to complete half of a 600 envelope job and then Jed and Fred team up to complete the job, how long will it take to complete the entire job?
A. 1/2 hours
B. 2/3 hours
C. 11/12 hours
D. 25 hours
E. 55 hours
A. 1/2 hours
B. 2/3 hours
C. 11/12 hours
D. 25 hours
E. 55 hours
17 Apr 2017, 06:17
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Option C
Jed: 7 envelops/min.
Ed: 3 envelops/min.
Fred: 5 envelops/min.
J + E = 10 envelops/min. [PS - Work efficiency can be added directly.]
J + E takes = (600/2)/10 mins. to stuff 300 (600/2) envelops. = 300/10 = 30 mins.
J + F = 12 envelops/min. [PS - Work efficiency can be added directly.]
J + F takes = (600/2)/12 mins. to stuff 300 (600/2) envelops. = 300/12 = 25 mins.
Total 30 + 25 = 55 mins. = 55/60 hours = 11/12 hours
Jed: 7 envelops/min.
Ed: 3 envelops/min.
Fred: 5 envelops/min.
J + E = 10 envelops/min. [PS - Work efficiency can be added directly.]
J + E takes = (600/2)/10 mins. to stuff 300 (600/2) envelops. = 300/10 = 30 mins.
J + F = 12 envelops/min. [PS - Work efficiency can be added directly.]
J + F takes = (600/2)/12 mins. to stuff 300 (600/2) envelops. = 300/12 = 25 mins.
Total 30 + 25 = 55 mins. = 55/60 hours = 11/12 hours
General Discussion
