A light blinks after every seconds, another light blinks after every seconds. How many times do they blink together in half an hour?
Step 1: Find the LCM of and
To find how many times they blink together in half an hour, we take the LCM of and
sec
Step 2: Find the number of times they blink together in half an hour
Number of times they blink together in mins
Hence, both the lights blink 120 times in the given period of half an hour.