A) 8 : 27: 12 h
B) 8 : 27 : 24 h
C) 8 : 27 : 36 h
D) 8 : 27 : 48 h
Correct Answer: A
Solution :
[a] Interval of change = LCM of 48 s, 72 s, 108 s = 432 s = 7 min 12 s Thus, the light will change after every 7 min 12 s. Time of next change = 8 : 27 : 12 h |
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