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What must be the lengths of steel and co...

What must be the lengths of steel and copper rods at `0^(@)C` for the difference in their lengths to be 10 cm at any common temperature?
`(alpha_(steel)=1.2xx10^(-5).^(@)K^(-1)and alpha_("copper")=1.8xx10^(-5).^(@)K^(-1))`

A

30 cm for steel and 20 cm for copper

B

20 cm for steel and 40 cm for copper

C

40 cm for steel and 30 cm for copper

D

30 cm for steel and 40 cm for copper

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The correct Answer is:
A
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