Question

Two alarm clocks ring their alarms at regular intervals of 72 seconds and 50 seconds
respectively if they first beep together at 12 noon at what time will they be again for
the second time ?​

Answer 1

Answer:

12:30 noon

Step-by-step explanation:

lcm =1800

which is 30 mins

Answer 2

Solution :-

The next time the clocks beep together at LCM of 72 seconds and 50 seconds .

So,

→ 72 = 2 * 2 * 2 * 3 * 3

→ 50 = 2 * 5 * 5

then,

→ LCM = 2 * 2 * 2 * 3 * 3 * 5 * 5 = 1800 seconds .

now we know that,

→ 60 seconds = 1 minutes

→ 1800 seconds = (1/60) * 1800 = 30 minutes .

therefore,

→ They will begin again at = 12 : 00 + 30 = 12 : 30 PM (Ans.)

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