Doubt from mechanics

right answer is option 3 plz solve this

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This one as well

@Abhishek_2020_5 ur solution is correct but i hve doubt how u can say both will travel to range may be possibility that they strike each other at any point then range will be change due to impluse na. if u will say they dont have given distance b/w particle but my doubt is one of case na??

@Sneha_2021 They will collide if they are thrown at the same time, but in the question it is not mentioned that they are thrown at the same time. So, it is safe to find their ranges seperately.