Three bells ring simultaneously at 11a . m . They ring at regular Intervals of 20 minutes. 30 minutes. 40 minutes respec- tively. The time when all the three ring together next Is

Three bells ring simultaneously at 11a . m . They ring at regular Intervals of 20 minutes. 30 minutes. 40 minutes respec- tively. The time when all the three ring together next Is
1). 2 p.m.
2). 1 p.m.
3). 1.15 p.m.
4). 1.30 p.m.

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