1.

4 bells ring at an interval of 4, 12, 20 and 25 minutes. If they ring together at 8 a.m. then at what time they will ring together?.1. 12 noon2. 1 p.m.3. 11 a.m.4. 2 p.m.

Answer» Correct Answer - Option 2 : 1 p.m.

Given:

4 bells beep at an interval of 4, 12, 20, and 25.minutes.

Beep together at 8 a.m.

Concept used:

Using LCM method

Calculation:

4 = 2 × 2

12 = 2 × 2 × 3

20 = 2 × 2 × 5

25 = 5 × 5

LCM of 4, 12, 20 and 25 = 2 × 2 × 3 × 5 × 5

⇒ 300 minutes 

⇒ 5 hour

So, 8 a.m. + 5 hour = 13 p.m. = 1 p.m.

∴ They will beep together again at 1 p.m.



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