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

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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 a.m, when will they next ring together?
A.	11:29 a.m.
B.	11:27 a.m.
C.	11:51 a.m.
D.	12:29 p.m.
Answer» C. 11:51 a.m.

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