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5. When the air conditioner in a building is running, the temperature in the
building changes at a rate of — 1 °F every 18 minutes. At this rate, how
many hours should it take to cool the building from a temperature of
85.5 °F to a temperature of 78 °F?

Respuesta :

Answer:

135min = 2hours and 15 minutes

Step-by-step explanation:

85.5F - 78F = 7.5F

it takes -7.5F to cool 85.5F to 78F

Since it takes 18 minutes to lower the temperature -1

18 × 7.5 = 135

135 minutes = 2 hours and 15 minutes

it takes 2 hours and 15 minutes to cool a room from 85.5 to 78 F

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