Question

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 second. green lights flash 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?

Answer 1

The highest common factor of 5, 3, and 4 is 60, so therefore the lights will flash at the same time after 60 seconds.