Two alarm clocks ring their alarms at regular intervals of 50 seconds and 48 seconds. If they first beep together at 12 noon, at what time will they beep again for first time?

A) 12:10 PM B) 12:12 PM C) 12:11 PM D) None of these

Answer & Solution

Correct Answer: Option D

They will ring together after,
LCM of 48 and 50 secs.
48 = 2 × 2 × 2 × 2 × 3;
50 = 2 × 5 × 5
LCM = 2 × 2 × 2 × 2 × 3 × 5 × 5 = 1200 secs
= 20 min.
They will beep together at 12:20

Question posted by Examveda

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4 Comments

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GowTham Sudhi 10 years ago

but the correct option is 12:10 ??

Siva 11 years ago

the lcm FOR 48 AND 50 IS 1200 SO THE NEXT TIME WOULD BE 12:20PM

Kumar Chandan 11 years ago

In tolling of alarm or ring, LCM is used to find out the least time.

Amartya Karan 11 years ago

why we are doing LCM of that two number... explain

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Two alarm clocks ring their alarms at regular intervals of 50...

Two alarm clocks ring their alarms at regular intervals of 50 seconds and 48 seconds. If they first beep together at 12 noon, at what time will they beep again for first time?

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