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 : 

A 10.30 a.m. 
B 10.31 a.m. 
C 10.59 a.m. 
D 11 a.m. 

+ Answer
B 

+ Explanation
solution:
L.C.M. of 60 and 62 seconds is 1860 sec = 31 min.
`:.` They will beep together at 10.31 a.m.

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Md. Habib Ullah

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