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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:<div class='q

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 AM


Option: 4

7.30 AM


Answers (1)

best_answer

Interval after which the devices will beep together = (L.C.M. of 30, 60, 90, 105) min.
= 1260 min. = 21 hrs. 
So, the devices will again beep together 21 hrs. after 12 noon i.e., at 9 a.m.

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