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15 Aug 2019, 00:00
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Difficulty:
15%
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Question Stats:
82% (02:05) correct
18%
(02:07)
wrong
based on 67
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Machine A produces nails at a uniform rate of 120 every 10 seconds, and Machine B produces nails at a uniform rate of 100 every 15 seconds. If the two machines run simultaneously, how many seconds will it take for them to produce a total of 140 nails?
A. 7.0
B. 7.5
C. 8.0
D. 8.5
E. 9.0
A. 7.0
B. 7.5
C. 8.0
D. 8.5
E. 9.0
15 Aug 2019, 00:00
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Bunuel
Machine A produces nails at a uniform rate of 120 every 10 seconds, and Machine B produces nails at a uniform rate of 100 every 15 seconds. If the two machines run simultaneously, how many seconds will it take for them to produce a total of 140 nails?
A. 7.0
B. 7.5
C. 8.0
D. 8.5
E. 9.0
A. 7.0
B. 7.5
C. 8.0
D. 8.5
E. 9.0
Similar question from OG: https://gmatclub.com/forum/machine-a-pr ... 43745.html
15 Aug 2019, 08:14
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Bunuel
Machine A produces nails at a uniform rate of 120 every 10 seconds, and Machine B produces nails at a uniform rate of 100 every 15 seconds. If the two machines run simultaneously, how many seconds will it take for them to produce a total of 140 nails?
A. 7.0
B. 7.5
C. 8.0
D. 8.5
E. 9.0
A. 7.0
B. 7.5
C. 8.0
D. 8.5
E. 9.0
rate of a ; 120/10 rate of b ; 100/15
total time ; 140/12+ 18.6 ; 7.5
IMO B
