Question

1.In a lighting, green light glows after every 12 seconds, red light glows after every 30 seconds, blue light glows after every 34 seconds and yellow light glows after every 56 seconds. Find the least time in minutes after which they all glow together.

Answer 1

Answer:

One day will have 24 × 60 × 60 = 86400 s.

No of times red light flashes in a day is -

Nr = 86400 / 15

Nr = 5760

No of times blue light flashes in a day is -

Nr = 86400 / 10

Nr = 8640

Counted together, red and blue light flashes together for 8640 + 5760 = 14400 times.

Answer 2

Answer:

the following answer is right