Question

3 bells ring continuosly at intervels of 30,40,45minutes respectively.at what time will they ring together if the ring simultaneously at5am

Answer 1

Find LCM:

30 = 2 x 3 x 5

40 = 2³ x 5

45 = 3² x 5

LCM = 2³ x 3² x 5 = 350 mins

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Find the time when it will ring together again:

360 mins = 6 hours

5am + 6 hours = 11 am

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Answer: It will ring together again at 11am