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

19 s/day

5.5 s/day

6.8 s/day

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