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Today, 12:20

In a science experiment, the temperature of a substance is changed from 42 degrees Fahrenheit to - 54 at an average rate of-12 degrees Fahrenheit per hour. Over how many hours does the change take place

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  1. Today, 12:51
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    8 hours

    Step-by-step explanation:

    The time required is the temperature difference divided by the rate of change of temperature:

    (-54 - 42) °F / (-12 °F/h) = - 96/-12 h = 8 h
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