an electric device makes a beep every 60 seconds. another device makes a beep every 62 seconds. they beep together at 10:30 am. find the time they will make a beep together at the earliest
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Solution
L.C.M. of 60 and 62 seconds is 1860 seconds 1860/60 = 31 minutes
They will beep together at 10:30 a.m. + 31 minutes = 11:01 a.m.