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?
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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
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