Question

Ata 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?
b) 11:27 a.
m
a) 11:29 a.m
c ) 11:51 a.
m d ) 12:29 p.m
​

Answer 1

Answer:

11:27 a.m.

Step-by-step explanation:

We take the LCM of 20, 24, 30, which is 120.

It tells us that they will together after an interval of 120 seconds = 2 minutes.

11:25 + 2 = 11:27

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Answer 2

lcm of 20 24 30 is 120 seconds

120 seconds ÷ 60 seconds = 2 min

now add

Step-by-step explanation:

11 : 25 + 2 = 11:27 am