Multiple Choice Questions on An electronic device makes a beep after every 30 seconds another device makes a beep after 72 second........... for SSC CGL Exam Preparation

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Multiple Choice Questions

An electronic device makes a beep after every 30 seconds another device makes a beep after 72 second...........

Quantitative Aptitude (CGL) LCM, HCF
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    An electronic device makes a beep after every 30 seconds another device makes a beep after 72 seconds. They beeped together at 8 am. When they will make a next beep together at the earliest?

    8.06 am 

    Correct Answer

    8.05 am

    Incorrect Answer

    8.09 am 

    Incorrect Answer

    8.10 am 

    Incorrect Answer
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    Explanation:

    Solution: LCM of (30, 72) is 360

    360sec/60= 6 mins,. So they beep together at 8.06 am 

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