Question 119
Three bells ring simultaneously at 11 a.m. They ring at regular intervals of 20 minutes, 30 minutes, 40 minutes respectively. The time when all the three ring together next is
Solution
Bells are ringing at a regular interval of 20 min. , 30 min. , 40 min. respectively
hence time duration after which they will ring together will be least common multiple of 20, 30, 40
i.e. = 120
hence after 11:00 am , 120 min. later they will ring together i.e. 1:00 pm
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