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    Question

    Three streetlights flash together. Each of them then

    flashes after 0.35 seconds, 0.2 seconds, and 0.105 seconds respectively. After how many seconds will they all flash together again?
    A 2.4 Correct Answer Incorrect Answer
    B 1.6 Correct Answer Incorrect Answer
    C 4.2 Correct Answer Incorrect Answer
    D 3.6 Correct Answer Incorrect Answer

    Solution

    0.35,   0.2,    0.105 multiplied by 0.001. 350,200,105 LCM of 350,200,105=4200 4200 × 0.001=4.2 =4.2

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