Question

1. There are three bells. First bell rings at every 10 seconds, the second bells rings at 15 seconds and the third bell rings at 20 seconds. If all the three bells ring at the same time, when do a) First and second bell ring together b) Second and third bell ring together c) First and third bell ring together d) All the three bells ring together.​

Answer 1

Answer:

a. 1st and 2nd bell will ring together when bell 1 rings thrice and bell no.2 has rung twice.

b. when the 2nd bell rings the 4th time, it will ring together with Bell 3 only if Bell 3 rings the third time

Very easy question, frequently asked. Just simple addition no other complications are required.

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