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A pendulum clock loses 12 s a day if the...

A pendulum clock loses 12 s a day if the temperature is `40^@C` and gains 4s a day if the temperature is `20^@C`. The temperature at which the clock will show correct time, and the coefficient of linear expansion`(alpha)` of the metal of the pendulum shaft are respectively:

A

`60^@C, alpha=1.85 xx 10^-4 /(@C)`

B

`30^@C, alpha=1.85 xx 10^-3 /(@C)`

C

`55^@C, alpha=1.85 xx 10^-2 /(@C)`

D

`25^@C, alpha=1.85 xx 10^-5 /(@C)`

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