Question
Four traffic lights blink at intervals of 3 seconds, 6
seconds, 9 seconds, and 12 seconds respectively. How many times will they blink together in 36 minutes?Solution
ATQ,
The lights will blink together after every 36 seconds or 0.6 minutes {LCM of (3, 6, 9, and 12)}
Number of times they will blink together in 36 minutes = (36 Ă· 0.6) = 60 times
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