A red light flashes 3 times per minute and a green light flashes 5 times in two minutes at regular intervals. : Crackverbal Support

A red light flashes 3 times per minute and a green light flashes 5 times in two minutes at regular intervals. Print

Modified on: Tue, 12 Oct, 2021 at 12:53 PM

Concept: The question tests on the area of LCM/HCF

Solution:

The red light flashes every 60/3 = 20 seconds and the green light flashes every 120 / 5 = 24 seconds

LCM of 20 and 24 = 120 second = 2 minutes

So after the first flash, they will flash together 60/2 = 30 times

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A red light flashes 3 times per minute and a green light flashes 5 times in two minutes at regular intervals. Print

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