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10th Class Mathematics Real Numbers Question Bank MCQs - Real Numbers

  • question_answer
                                              Two alarm clocks ring their alarms at regular intervals of 50 seconds and 48 seconds. If they first beep together at 12 noon, at what time will they beep again for the first time?

    A) 12.20 pm

    B) 12.12 pm

    C) 12.11 pm

    D) None of these

    Correct Answer: A

    Solution :

    Sol.      [a] LCM of 50 and \[\text{48}=\text{12}00~\]
    \[\text{12}00\text{ sec}=\text{2}0\text{ min}\]
    Hence, at 12.20 pm they will beep again for the first time.


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