Question

Three bells ring together at intervals of 10,15 and 20 minutes respectively . If they all ring at 10 am together at what time will they ring together again?

Answer 1

Answer:

They will ring together at 11 am.

By taking lcm;

Lcm =60 min.

So, they ring together at 10+1 hr = 11 hr.

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Answer 2

Answer:

11 am

Step-by-step explanation:

in these type of question we have to find a number that is common to all given times so we will find the LCM OF GIVEN numbers

therefore LCM OF times is

60

so

they will all ring again after 60min because every bell has this time as there multiple

hence they will ring after 60 min so

at 11am