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15 Aug 2019, 00:00
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B
Be sure to select an answer first to save it in the Error Log before revealing the correct answer (OA)!
Difficulty:
15%
(low)
Question Stats:
83% (02:04) correct
17%
(02:06)
wrong
based on 81
sessions
History
Date
Time
Result
Not Attempted Yet
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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Archit3110
Major Poster
15 Aug 2019, 08:14
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Bunuel
rate of a ; 120/10 rate of b ; 100/15
total time ; 140/12+ 18.6 ; 7.5
IMO B
