The Timing....!
Number Theory
Level
2
Four different electronic devices make a beep after every 30 minutes, 1 hour, 1hour 30 minutes and 1 hour 45 minutes respectively. All the devices beeped together at 12 noon. They will again beep together at what time?
3 a.m.
6 a.m.
9 a.m.
12 midnight
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1 solution
Simple take LCM AND GET IT SOLVED