@1Tt
In this question there you have to first understand that ring of iron is to be fitted on the wooden rim of the wheel so in this question radius of both the wooden rim wheel and iron ring radius Is given to you so basically as you can see in the question that radius of ring is given small then the wooden rim of wheel so to fit it on the rim you have to heat it so that iron can expand and can easily fit on the wheel
As first the iron is at room temperature which is 27°C and we know the ã value for iron and initial and final radius are given so just put the values in the formula and find the final temperature
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