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03 Jun 2025, 00:30
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E
Be sure to select an answer first to save it in the Error Log before revealing the correct answer (OA)!
Difficulty:
95%
(hard)
Question Stats:
34% (01:45) correct
66%
(01:24)
wrong
based on 152
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Not Attempted Yet
The signage of ABC business school has flashing neon lights that flash at regular intervals. The words ABC, business & school flash at intervals of 2, 4, and 5 seconds respectively, and each word is put off after a second. If all 3 words started flashing together when switched on, what is the least time after which the full name is on?
A. 10
B. 15
C. 20
D. 25
E. 30
Gentle note to all experts and tutors: Please refrain from replying to this question until the Official Answer (OA) is revealed. Let students attempt to solve it first. You are all welcome to contribute posts after the OA is posted. Thank you all for your cooperation!
A. 10
B. 15
C. 20
D. 25
E. 30
Gentle note to all experts and tutors: Please refrain from replying to this question until the Official Answer (OA) is revealed. Let students attempt to solve it first. You are all welcome to contribute posts after the OA is posted. Thank you all for your cooperation!
03 Jun 2025, 10:06
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Bunuel
ABC flashes at every 2 seconds.
Business flashes every 4 seconds.
School flashes every 5 seconds.
They flash together at the start.
After LCM of (2,4,5) = 4*5 = 20 seconds, They flash together again for the second time.
So, the minimum time frame the whole sentence flashing is 20 seconds.
Option C
Updated on: 04 Jun 2025, 03:45
Originally posted by ManifestDreamMBA on 03 Jun 2025, 10:31.
Last edited by ManifestDreamMBA on 04 Jun 2025, 03:45, edited 1 time in total.
Last edited by ManifestDreamMBA on 04 Jun 2025, 03:45, edited 1 time in total.
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Since each word is put off after a second, the effective flash intervals become 3,5 and 6 seconds
Least time after which the full name is on = LCM(3,5,6) = 30
Least time after which the full name is on = LCM(3,5,6) = 30
Bunuel
