Four different electronic devices make a beep after every 30 minutes, – McqOptions

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1.	Four different electronic devices make a beep after every 30 minutes, 1 hour, 1 1/2 hour and 1 hour 45 minutes respectively. All the devices beeped together at 12 noon. They will again beep together at:
A.	12 midnight
B.	6 a.m.
C.	3 a.m.
D.	9 a.m.
Answer» E.

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