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5
Step-by-step explanation:
The bells will ring together at the intervals which is equal to the lcm of 7,8,11 and 12
7 and 11 are prime number8=2x2x2
12=2x2x3
Do LCM is 7x8x11x3=1848
So the bells will ring together in every 1848 seconds
There will be 10800 seconds in 3 hours
When 10800 is divided by 1848 , the quotient is 5. So the bell will ring together 5 times in the next 3 hours
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