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Four different devices beep after every half hour, 60 min, 1 and half hours, and 135 min respectively. All the devices beeped together at 12 noon. They will beep together again at:

Option 1)

12 Midnight

Option 2)

6 AM

Option 3)

9 PM

Option 4)

7: 30 AM

Option 5)

9 AM

Answers (2)

best_answer

A = 30 min

B = 60 min

C = 90 min

D = 105 min

LCM of ABCD = 1260 min or 21 hours

Required Time = 12 Noon + 21 => 9AM

Posted by

rishi.raj

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4

Posted by

Kundan kumar

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