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5 bells struck at intervals of 6,8,9 &12 seconds. they struck simultaneously with a clock at 12 noon which strikes every hour. at what time will they

again strike together with the clock? this is related to real numbers & HCF or LCM of numbers of class 10


Find the LCM of 6, 8, 9 and 12 which will be 72. Which means that after every 72 seconds all four bells will at the same time. So, the next bell at the same time will be 12:01:12.
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i knew this but the answer given is 1 hour.........:( that's why i am struck to this silly question
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