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A hot brick is removed from a kiln at 225C above room temperature. Over time,...

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Calculus

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A hot brick is removed from a kiln at 225C above room temperature. Over time, the brick cools off. After 2 hours have elapsed, the brick is 30 C above room temperature. Let t be the time in hours since the brick was removed from the kiln. Let y = H(t) be the difference between the brick's and the room's temperature at time t. Assume that H(t) is an exponential function. How much time elapses before the brick's temperature is 10C above room temperature? Round your answer to 2 places after the decimal.

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