A string of holiday lights at a store have three colors that flash at different times. Red lights flash every fifth second. Blue lights flash every third seconds. Green light flashes every four seconds.

A string of holiday lights at a store have three colors that flash at different

times. Red lights flash every fifth second. Blue lights flash every third
seconds. Green light flashes every four seconds. The store owner turns on
the lights. After how many seconds will all three lights flash at the same
time for the first time?

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