A person's body converts chemical energy into internal energy at a metabolic rate of \(100\text{ kcal/h}\). The person stands neck-deep in an insulated tub containing \(0.8\text{ m}^3\) of water at \(20^\circ C\). Disregarding energy loss from the tub, determine the change of water temperature in 45 minutes.

Specific Heat of water is \( 1 \text{ cal/g}^\circ C \).

(Answer In \(^\circ C\))

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