Multiple Choice Questions on The traffic lights at three different road crossing change after every 48 sec 72 sec and 108 sec res........... for Mathematics - All Exams Preparation

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Multiple Choice Questions

The traffic lights at three different road crossing change after every 48 sec 72 sec and 108 sec res...........

Quantitative Aptitude ( CCS) LCM, HCF
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    The traffic lights at three different road crossing change after every 48 sec; 72 sec; and 108 sec., respectively.  If they all change simultaneously at 8:20:00 hrs, then they will again change simultaneously at

    8:27:12 Hrs

    Correct Answer

    8:27:24 Hrs

    Incorrect Answer

    8:27:36 Hrs

    Incorrect Answer

    8:27:48 Hrs

    Incorrect Answer
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    Explanation:

    The change of interval=(LCM of 48,72,108)sec.=432.

    So, for every 432 seconds i.e.7 min. 12 sec.

    the lights will change.  

    So add 7 min.12 sec.to 8:20:00 Hrs.i.e.8:27:12 Hrs.

    Hence, option 1 is the correct answer.

    By: Amit Kumar
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