Three electronic devices make a beep after every 48 sec, 72 sec and 108 sec respectively. They beeped together at 10 a.m. The time when they will next make a beep together at the earliest is?
Show answer & explanation
Correct answer: A
Explanation
The correct answer is option 1 i.e. 10:07:12 hrs
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Understanding |
Application |
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Three electronic devices make a beep after every 48 sec, 72 sec and 108 sec respectively. |
So, LCM of 48, 72 and 108 = 432 The devices will beep together after 432 seconds or 7 min 12 seconds |
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They beeped together at 10 a.m. |
So, Time when they will next make a beep together at the earliest = 10:07:12 hrs |