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- The three bulbs flash at 80s, 90s and 110s respectively. Therefore, they will flash together at LCM of (80,90,110), that is after 7920 seconds = 132 minutes = 2 hours 12 minutes. Therefore, after every 2 hours 12 minutes, all three bulbs will flash together
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2.It is given that three bells tolls at the intervals of 9, 12, 15 minutes respectively. We need to find out if they start tolling together after what time they next toll together. So, the answer is 180. If they start tolling together then it will rung after 180 minutes
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