At a telephone exchange, three phones ring at intervals of 20 sec, 24 – McqOptions

MCQOPTIONS

1.	At a telephone exchange, three phones ring at intervals of 20 sec, 24 sec and 30 seconds - If they ring together at 11:25 am, when will they next ring together?
A.	11:29 pm
B.	11:27 am
C.	11:51 am
D.	12:29 pm
Answer» C. 11:51 am

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