At 12 noon in Anchorage, Alaska, Janice noticed that the temperature outside was #12^\@#F. The temperature dropped at a steady rate of 2 °F per hour. At what time was the temperature -4°F?

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Answer 1 · 2017-10-11T15:41:42

8:00 pm or 20:00 hrs

The overall temperature drop is:

#12^oF-(-4^oF)= 16^oF#

This dropped at the rate of #2^oF# per hour.

So:

Number of hours to drop to #-4^oF#

#(16^oF)/(2^oF)=8# hours

The time of day when the temperature dropped to #-4^oF#

#12# noon + 8 hrs = 8:00 pm or 20:00 hrs