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Question

Answer

G – 3x 3, 6, 9, 12, …….
O – 4x 4, 8, 12, 16, ……
R – 6x 6, 12, 18, ……

Lowest common multiple is 12
Ans: the next time all 3 lights will blink again is 8.12am

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This is LCM problem, Green blinks every 3mins, so it would blink at 8:00, 8:03, 8:06, 8:09 and 8:12 PM and so on. Similarly orange¬†would blink at 8:00, 8:04 8:12 PM… and red at 8:00, 8:06, 8:12 and so on.

So next time they all black together at 8:12 or to generalise after every 12 min’s interval they’d blink together.¬†

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