A red light flashes 3 times per minute, green light flashes 4 times per minute and yellow light
flashes 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 3*75 min =225
Green light 4*75 = 300
Yellow Light 6*75 = 450
Green light 4*75 = 300
Yellow Light 6*75 = 450
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