three bells ring at a time interval of 20, 40 and 60 minutes respectively, if they have rung together now, after how lo g will thet next ring together
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LCM of 20,40 and 60 is 120 so the bell will ring after 2 hours
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Answer:
LCM of 20,40,60 =120
1 hour = 60 minutes
2 hour = 120 minutes
Answer =2 hours or 120 minutes
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