A substance of mass \( m \mathrm{~kg} \) requires a power input of \( P \) watts to remain in th...

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A substance of mass \( m \mathrm{~kg} \) requires a power input of \( P \) watts to remain in the molten state at its melting point. When the power is turned off, the sample completely solidifies in time \( t \mathrm{sec} \). What is the latent heat of fusion of the substance
[IIT JEE 1992]
(a) \( \frac{\mathrm{Pm}}{\mathrm{t}} \)
(b) \( \frac{P t}{m} \)
(c) \( \frac{m}{P t} \)
(d) \( \frac{t}{P m} \)
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