# Temperature 5

Temperature outside starts at 0 Fahrenheit. Over time the temperature changes at a rate of -0.6 Fahrenheit per hour. How long will it take for the temperature to reach -4.5 Fahrenheit?

Result

t =  7.5 h

#### Solution:

$t_{1}=-4.5 \ ^\circ \text{F} \ \\ t_{0}=0 \ ^\circ \text{F} \ \\ r=-0.6 \ ^\circ \text{F/h} \ \\ \ \\ t=(t_{1}-t_{0}) / r=((-4.5)-0) / (-0.6)=\dfrac{ 15 }{ 2 }=7.5 \ \text{h}$

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Math student
well done thanku

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