SOLUTION: one light flashes once every 6 seconds,a second light flashes every 5 second s and a third light flashes every 15 seconds how many times will they flash at the same time in one hou

Question 869392: one light flashes once every 6 seconds,a second light flashes every 5 second s and a third light flashes every 15 seconds how many times will they flash at the same time in one hour.

Answer by mananth(16946) (Show Source): You can put this solution on YOUR website!
One light ----------6 sec
II light ------------12 sec
III light -----------15 sec
Take the LCM of 6,12,15
=30
every 30 seconds they flash together
in a minute 2 times
in 60 minutes 120 times
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