Find out the temperature using linear expansion co-efficient [closed]

The coefficient of linear expansion of iron is .0012 / C(I know this isn't). At what temperature a 21 meters long iron rod(measured at 0C) will exactly fit a case which is 22 meters long?[Neglect the expansion of the case]

I hope you didn't misunderstand me. This isn't a homework. I was attempting some past question from Bangladesh physics Olympiad- bdpho.org Well the answer I got to this problem was approximately 40C. If anybody could please confirm using the co-efficient of linear expansion formula.

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closed as too localized by Manishearth♦Jan 18 at 16:07

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