Question

There are three consecutive traffic lights which turn green after every 36, 42 and 72 seconds.They all were green at 9:00 a.m. At what time they all will turn green simultaneously?​

Answer 1

it wil turn green after 3 seconds as

by taking LCM of these consecutive

number

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Answer 2

The answer will be after 6 seconds

you can find it by taking HCF of 36,42, and 72..

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