Five clocks ring at an interval of 3, 4, 5, 6 and 7 seconds respective – McqOptions

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1.	Five clocks ring at an interval of 3, 4, 5, 6 and 7 seconds respectively. After how much time they will ring together once they ring together at same time?
A.	3 minutes 30 second
B.	5 minutes
C.	7 minutes
D.	6 minutes
Answer» D. 6 minutes

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