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Two bells start ringing together. First bell rings after every three minutes and second bell rings after every five minutes

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Two bells start ringing together. First bell rings after every three minutes and second bell rings after every five minutes then after how much time both bells will ring together?

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Since, first bell rings after every three minutes and second bell rings after every five minutes. 

∴ L.C.M. of 3 and 5 = 3 × 5 = 15 

Thus, both bells will ring together, after 15 minutes.

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