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In a shope there are 3 clocks which alarm at an intervel of 15,25 and 30 minutes respectively.All clocks alarm together at 9 am . At what time will they all alarm together again? give explanation
LCM of 15, 25, 30 = 150 min
 150 min = 2 hour and 30 minute.
So the answer is 9 + 2.30 = 11.30
 


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