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 am.
C. 11:51 a.m.
D. 12:29 p.m.
Answer:B
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 am. C. 11:51 a.m. D. 12:29 p.m.