GATE 2021 MT – Question 3
Digital watch X beeps every 30 seconds and watch Y every 32 seconds. They beep together at 10 AM. The immediately next time they beep together is ______.
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Correct answer: (A) 10:08 AM
Explanation
LCM(30,32)=480 seconds, since their greatest common divisor is 2. This is eight minutes after 10 AM, so **10:08 AM, A**.