Question

Ata telephone exchange, three phones ring at intervals of 20 sec, 24 sec and 30 seconds. If they ring<br />together at 11:25 a.m, when will they next ring together?<br />b) 11:27 a.<br />m<br />a) 11:29 a.m<br />c ) 11:51 a.<br />m d ) 12:29 p.m<br />​

Answer 1

Answer:

Step-by-step explanation:

Find the lcm of 20,24,30 and add to the time