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Three bells ring simultaneously at 11a.m. They ring at regular intervals of 20 minutes, 30 minutes, 40 minutes respectively. The time when all the three ring together next is
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- 2 p.m.
- 1 p.m.
- 1.15 p.m.
- 1.30 p.m.
Correct Option: B
LCM of 20, 30 and 40 minutes = 120 minutes
Hence, the bells will toll together again after 2 hours i.e. at 1 p.m.
Required time = 1 p.m.
