A) 12.20 pm
B) 12.12 pm
C) 12.11 pm
D) None of these
Correct Answer: A
Solution :
Sol. [a] LCM of 50 and \[\text{48}=\text{12}00~\] |
\[\text{12}00\text{ sec}=\text{2}0\text{ min}\] |
Hence, at 12.20 pm they will beep again for the first time. |
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