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What is the time when they will again shine simultaneously?

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In a marriage party, three different lights shine after every 10 seconds, 15 seconds and 25 seconds respectively, if all these lights change simultaneously at 6 : 25 : 00 hours.
What is the time when they will again shine simultaneously?

posted Feb 3, 2020 by Basabdatta Mukherjee

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1 Answer

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the lights will be in sync again after 150 secs (LCM of 10,15 and 25)
i.e. after a further 2 mins 30 secs

answer Feb 3, 2020 by Stanley Comley

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