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An electronic device makes a beep after ...

An electronic device makes a beep after every `60` sec. Another device makes a beep after every `62` sec. They beeped together at `10` a.m. The next time, when they would beep together at the earliest is

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Minimum time interval of beeping together = L.C.M. of 60 sec and 62 sec ltb rgt Now , `" " 60 = 2 xx 2 xx 3 xx 5 , 62 = 2 xx 31`
L.C.M . = `2 xx 2 xx 3 xx 5 xx 31 = 1860` seconds
`= (1860)/(60)` min = 31 min
So , they will beep together again at `5 : 31` am .
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