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प्रश्न
Three bells toll at intervals of 9, 12, 15 minutes. If they start tolling together, after what time will they next toll together?
उत्तर
Three bells toll at intervals of 9, 12 and, 15 minutes.
The time when they will toll together again is given by the LCM of 9, 12, and 15.
Required time = 22 × 32 × 5
= 180 minutes
=3 h
If they start tolling together, they will toll together again after 3 h.
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