Three bells ring at interval of 15 ,20 and 30 minutes .if they all ring at 11 am together at what

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Thankyou so much sir ji 🙏🙏🙏🙏 great 👍👍👍👍👍👍👍👍

lovely
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Three bells ring at intervals of 15, 20 and 30 minutes. If they all ring at 9 o'clock

in the morning, at what time will they ring together again?

lakshya