a neon sign flashes every 3 sec another flashes every 5 sec and 3rd one flashes every 7 sec.If started together how much time will pass when all three flashes together?
Answers
Answer:
In this question we basically have to find the LCM of 3,5,7
So the LCM of 3,5,7 = 3*5*7= 105
(We multiply all their factors)
Therefore the answer is 105!!!!
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Step-by-step explanation:
Answer
Both the lights blink 17.14 times in the given period of half an hour.
Given
A light blinks after every 3 seconds, another light blinks after every 5 seconds.
Find out
We have to find how many times they blink together in half an hour.
Solution
According to the given details
We take the LCM of 3 and 5,7
i.e, LCM(3,5,7) = 105
1 hour = 60 minutes = 3600 seconds
1/2 hr = 3600/2sec
= 1800sec
Number of times they blink together
Times in 30 mins= 1800/105 = 17.14
Hence, both the lights blink 17.14 times in the given period of half an hour.