Four electronics devices make a beep after every 20 minutes, 40 minutes, 1 hour and 1Â½ hour respectively. All the devices beeped together at 12 noon. At what time will they beep together again?

Four electronics devices make a beep after every 20 minutes, 40 minute

1.	Four electronics devices make a beep after every 20 minutes, 40 minutes, 1 hour and 1Â½ hour respectively. All the devices beeped together at 12 noon. At what time will they beep together again?
A.	4 PM
B.	5 PM
C.	6 PM
D.	7 PM
Answer» D. 7 PM

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Four electronics devices make a beep after every 20 minutes, 40 minutes, 1 hour and 1Â½ hour respectively. All the devices beeped together at 12 noon. At what time will they beep together again?

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