Question

5
Bells A, B and C will ring at intervals of 20 minutes, 30 minutes and 15 minutes.
In the beginning if they ring together, after how many minutes will the bells ring
together?​

Answer 1

Step-by-step explanation:

The bell will again rang together after the time which is equal to LCM of the times. So, we need to find the LCM of 20, 30 and 45. Hence, the bells will ring together after 180 min = 3 hours.

Hope this answer will help you

Answer 2

Answer

After 1hr 5mins ( 65mins )

Breif Answer:

The bells ring together first.

Bell 'A' rings after a interval = 20 mins

Bell 'B' rings after a interval = 30 mins

Bell 'C' rings after a interval = 15 mins

Again the bells ring together after a period of time = 65

Therefore 1hr 5mins.