High School

In Baguio City, a thermometer reading of 80 degrees Fahrenheit is taken outside where the temperature is 20°F. Five minutes later, the thermometer reads 40°F. How long after being taken outside is the thermometer reading within one-half degree of the outside temperature?

Answer :

Final answer:

The thermometer reading gets within one-half degree of the outside temperature 10 minutes after being taken outside.

Explanation:

The thermometer reading gets within one-half degree of the outside temperature 10 minutes after being taken outside.

  1. Step 1: Calculate the decrease in temperature outside: 80°F - 20°F = 60°F
  2. Step 2: Find out how many degrees temperature decreases per minute: 60°F / 5 minutes = 12°F per minute
  3. Step 3: Determine how long it takes for the thermometer to get within one-half degree of the outside temperature: 12°F x 5 minutes = 60°F, thus 60°F / 12°F = 5 minutes

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