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A rod of length 20 cm is made of metal. ...

A rod of length `20 cm` is made of metal. It expands by `0.075 cm` when its temperature is raised from `0^(@)C` to `100^(@)C`. Another rod of different metal `B` having the same length expands 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 `A` and the oher of metal `B`. This rod expandss by `0.060 cm` for the same change in temperature. The portion made of metal `A` has the length :

A

`20cm`

B

`10cm`

C

`15cm`

D

`18cm`

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