1. A red light flashes 3 times per minute, green light flashes 4 times per minute and yellow lightflashes 6 times per minute at regular intervals. If all three lights start flashing at the same time,how many times do they flash together in each 75 minutes?
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red light flash in interval of 20 second
green ----------//-------------of 15 second
yellow ------------//---------- of 10 second
interval 75*60 second
lcm of (20,15,10) =60
that means every 60 second they flash together once!
75*60/60=75
they flash together 75 times
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