Tira noticed that every 30 sec, the temperature of a chemical reaction in her lab was decreasing by the same number of degrees. Initially, the temperature was 28˚C and 5 min later, –12˚C. In a second experiment, Tira noticed that the temperature of the chemical reaction was initially –57˚C and was decreasing by 3˚C every minute. If she started the two experiments at the same time, when were the temperatures of the reactions the same? What was that temperature?
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