LCM of Time Intervals for Beeping Devices
CMAT 2026 · Quantitative Techniques & Data Interpretation · Easy · Number System
Four different electronic devices make a beep after every 30 minutes, 1 hour, hour and 1 hour 45 minutes, respectively. All these devices beeped together at 12 noon. They will again beep together at
- A.
12 midnight
- B.
3 AM.
- C.
6 AM.
- D.
9 AM.
Answer
D
Explanation
Intervals in minutes: 30, 60, 90, 105. LCM(30, 60, 90, 105) = 1260 minutes = 21 hours. 12 noon + 21 hours = 9 AM next day.
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