Multiple Choice Questions on Four bells ring at intervals of 4 6 8 and 14 seconds They start ringing simultaneously at 12 00 O rs........... for Mathematics - All Exams Preparation

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Multiple Choice Questions

Four bells ring at intervals of 4 6 8 and 14 seconds They start ringing simultaneously at 12 00 O rs...........

Quantitative Aptitude ( CCS) LCM, HCF
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    Four bells ring at intervals of 4, 6, 8 and 14 seconds. They start ringing simultaneously at 12.00 O’clock. At what time will they again ring simultaneously?

    12 hrs. 2 min. 48 sec

    Correct Answer

    12 hrs. 3 min.

    Incorrect Answer

    12 hrs. 3 min. 20 sec

    Incorrect Answer

    12 hrs. 3 min. 44 sec

    Incorrect Answer
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    Explanation:

    LCM of 4, 6, 8, 14 = 168 seconds

    LCM = 3 × 2 × 7 × 2 × 2 = 168 seconds
    = 168/60=2(48/60) = 2 minute 48 seconds
    ∴Ist they start ringing at 12.00 o’clock
    ⇒again they ring all together after 2 minutes 48 seconds at 12 hrs. 2 min. 48 seconds
    Hence, option 1 is the correct answer.

    By: Amit Kumar
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