Question

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 time when they will next make a beep together at the earliest is

Answer 1

time after they beep together =LCM of 60 and 62
i.e.2×2×3×5×31=1860sec
$= \frac{1860}{60} minutes$
=31min

time when they beep together =10a.m.+31min
=10:31

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