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d. is right answer
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>> They start tolling together, they will ring together at LCM of 9, 12 and 15.
>> So, We have to find LCM of 9 , 12 and 15.
>> 9 = 3×3
12 = 2×2×3
15 = 3×5
>> LCM = 3×3×2×2×5 = 180
>> It means the bells will toll together after 180 minutes or 3 hours.
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