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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 ?

A

10.4 seconds

B

20.6 seconds

C

5.6 seconds

D

15.4 seconds

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The correct Answer is:
A
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