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 lights start flashing at the same time,how many times do they flash together in each 75 minute?
Answers
Answered by
81
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
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
Answered by
11
Answer:
Red: 20, 40, 60, 80 ...
Green: 15, 30, 45, 60, 75 ...
Yellow: 10, 20, 30, 40, 50, 60, 70, 80 ...
Three lights flashing same seconds = 60
They flash only one time together in each 1 minute.
Answer: 75
Step-by-step explanation:
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