A clock which keeps correct time at ${20^o}C$, is subjected to ${40^o}C$. If coefficient of linear expansion of the pendulum is $12 \times {10^{ - 6}}/^\circ C$. How much will it gain or loose in time
  • A$10.3$ seconds / day
  • B$20.6$ seconds / day
  • C$5$ seconds / day
  • D$20$ minutes / day
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