Question

12. Two bells ring at an interval of

40 minutes and 60 minutes
respectively. If both the bells
rang together at 9 am for the
first time, at what time they will
ring again for the second time at
the same time?
*​

Answer 1

Answer:

11am

Step-by-step explanation:

Interval of first bell = 40min

Interval of second bell =60min

Common Interval of both bells = L.c.m of both intervals = lcm(40,60)=120

Therefore,next time bells ring at same time = 9am +2hrs=11am

Answer 2

Answer:

11 am

Step-by-step explanation:

You have to take the LCM of the two

First Bell: 40 min * 3 = 120 min

Second Bell: 60 min * 2 = 120 min

So 120 min is the LCM and they will ring together after 120 min.

120 min = 2 hours

9 am + 2 hours = 11 am Ans

Hope It Helps!