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Question

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?


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Solution

Step 1: Find the LCM of 3 and 5

To find how many times they blink together in half an hour, we take the LCM of 3 and 5

LCM(3,5)=15 sec

Step 2: Find the number of times they blink together in half an hour

12hour=30min=36002sec=1800sec

Number of times they blink together in 30 mins=180015=120

Hence, both the lights blink 120 times in the given period of half an hour.


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