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A pendulum clock runs 10 seconds slow per day when room temperature is $30^{\circ} C .$ It runs 20 seconds fast per day when room temperature is $15^{\circ} C .$ The temperature at which clock shows correct time is

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25∘C

22.5∘C

20∘C

35∘C

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detailed solution

Correct option is A

ΔT=12αΔt T

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A pendulum clock runs 10 seconds slow per day when room temperature is 30∘C. It runs 20 seconds fast per day when room temperature is 15∘C. The temperature at which clock shows correct time is

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Ready to Test Your Skills?

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A pendulum clock runs 10 seconds slow per day when room temperature is $30^{\circ} C .$ It runs 20 seconds fast per day when room temperature is $15^{\circ} C .$ The temperature at which clock shows correct time is