A clock which keeps correct time at 20^(...

A clock which keeps correct time at `20^(@)C` is subjected to `40^(@)C.` If coefficient of linear expansion of the pendulum is `12xx10^(-6)//"^(@)C.` How much will it gain or loss in time ?

`10.3" s day"^(-1)`

`20.6" s day"^(-1)`

`5" s day"^(-1)`

`20" min day"^(-1)`

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