Question

Three bells ring at the interval of 20 minutes, 30 minutes and 40 minutes. When will they ring together if they ring together at 9:45 am? Plz answer the question

Answer 1

The time they will ring together is given by the Lowest Common Multiple of 20, 30 and 40 which is 120 minutes

So they'll ring together at 9.45 am + 120 minutes

= 9.45 + 2 hours = 11.45 am Answer

Answer 2

`\text{lcm}(20,30,40)=120`

So, they'll ring together again in 120 minutes.

120 min = 2 h
9:45 + 2:00 = 11:45