Four different electronic devices mak...

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) 3 a.m. (c) 6 a.m. (d) 9 a.m.

12 Mid night

`3` AM

`6` AM

`9` AM

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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 beped together at 12 noon.They will again beped together at (a) 12 midnight (b) 3 a.m.(c) 6 a.m.(d) 9 a.m.

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