Four bells ring at the intervals of 5, 6, 8 and 9 seconds. All the bel – McqOptions

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1.	Four bells ring at the intervals of 5, 6, 8 and 9 seconds. All the bells ring simultaneously at some time. They will again ring simultaneously after:
A.	6 minutes
B.	12 minutes
C.	18 minutes
D.	24 minutes
Answer» B. 12 minutes

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