The traffic lights at three different road crossings change after every 18, 72 and 108 seconds respectively. If they change simultaneously at 7:00 am, at what time will they change simultaneously again?
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Answer:
7:03 AM and 36 seconds
Step-by-step explanation:
Time at which they rang together=7 o'clock
LCM of 18,72,108=216
216 in to minutes=3 minutes and 36 seconds
7 o'clock +3 minutes 36 seconds=7:03 AM and 36 seconds
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