A) 10 : 07: 12 h
B) 10 : 07 : 24 h
C) 10 : 07 : 36 h
D) 10 : 07 : 48 h
Correct Answer: A
Solution :
[a] First we have to find out the LCM of 48 s, 72 s and 108 s. \[\therefore \] LCM of 48 s, 72 s and 108 s = \[=2\times 2\times 2\times 2\times 3\times 3\times 3\,s\] \[=432\,\,s=\frac{432}{60}\min =7\min 12\,\,s\] \[\therefore \] Time of beep together of devices \[=10:00+07:12=10:07:12\] |
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