A red light flashes 3 times per minutes and a green light flashes 5 times in two minutes at regular intervals. If both lights start flashing at the same time, how many time do they flash together in each hour?
A red light flashes 3 times per minutes and a green light flashes 5 times in two minutes at regular intervals. If both lights start flashing at the same time, how many time do they flash together in each hour?