A light blinks after every 3 seconds, another light blinks after every 5 seconds. How many times do they blink together in half an hour?

A light blinks after every 3 seconds, another light blinks after every 5 seconds. We have to find How many times do they blink together in half an hour.

According to question,

We take the LCM of 3 and 5

i.e, LCM(3,5)=15

1 hour = 60 minutes = 3600 seconds

1/2 hr = 3600/2sec

= 1800sec

Times in 30 mins= 1800/15 = 120

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