Question

a. There are three bells at an interval of 10,15 and 20 minutes respectively. If they all ring together at 9 am, at what time will they ring together?

Answer 1

Answer:

at 10 am they will ring together

Step-by-step explanation:

LCM OF 10, 15 AND 20 IS 60.

so after 60 mins they will ring together i.e. at 10 am they will ring together

Answer 2

the Times are 10min ,15min,20min

so find the LCM OF 10,15,20 is 60

so 1 hour is = 60 minutes

so the next ball will ring after 1 hour that is 10:00