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There bells ring at intervals of 15, 20 and 30 minutes respectively. If they all ring at 11.00 a.m. together, at what time will they next ring together?
- A11.30 a.m.
- B12 noon
- C12.30 p.m.
- D1.00 p.m.
Answer not set
Discussion 1
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CCommunity
L. C. M. of 15, 20 and 30 minutes = 60 minutes
Hence, the bells will ring together after 60 minutes.
? All the bells were ring at 11.00 a.m.
∴ At 12 noon, all the bells will ring together.
Hence, the bells will ring together after 60 minutes.
? All the bells were ring at 11.00 a.m.
∴ At 12 noon, all the bells will ring together.