Question

5. 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:

236 minutes or 14280 seconds

Explanation:

12=2×2×3 , 30= 2×3×5 ,

34= 2×17 , 56= 2×2×2×7,

So,

LCM(12,30,34,56) = 2×2×2×3×5×7×17

=14280

Hence, all lights glow together after 14280 seconds or after 236 minutes.

[ 1min = 60sec]