Question

For an experiment, the temperature of a liquid must stay above 60°F . The starting temperature of the liquid is 90°F . It is placed in a cooler, which lowers its temperature 3°F each minute.

Which statement describes how many minutes the liquid can stay in the cooler?


The liquid must be in the cooler fewer than 10 minutes.

The liquid must be in the cooler fewer than 15 minutes.

The liquid must be in the cooler fewer than 30 minutes.

The liquid must be in the cooler fewer than 60 minutes.

Answer 1

Answer:

A - fewer than 10 minutes.

Explanation:  Since it lowers 3° each minute, the temperature would be AT 60° in the first 10 minutes (90 - (3 x 10)).  If the liquid stayed any longer the temperature would become lower than 60°