A rod of length 20 cm is made of metal. It expands by 0.075 cm when its temperature is raised from 
to 
. Another rod of a different metal 
having the same length expand by 0.045 cm for the same change in temperature. A third rod of the same length is composed of two parts, one of metal 
and the other of metal 
. This rod expands by 0.060 cm for the same change in temperature. The portion made of metal 
has the length:
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B
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