In a shop, there are 3 clocks which chime once in 5 minutes, 12 minutes
and 15 minutes. They all chime together at half past six in the evening.
When will they all chime together again?
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the time interval after which the clocks chime together
=lcm(5,12,15)=60min=1hr
the clocks chime together last at 6:30
the time they next time chime together is 6:30+1hr i.e. 7:30
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