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    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?
    A 20 Correct Answer Incorrect Answer
    B 60 Correct Answer Incorrect Answer
    C 30 Correct Answer Incorrect Answer
    D 75 Correct Answer Incorrect Answer

    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 ├╖ 0.6) = 60 times

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