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Question:

A roast was cooked at 325 °F in the oven for 4 hours. The internal temperature rose from 32 °F to 145 °F.What was the average rise in temperature per hour?

A 28.25°F/hr
Explaination

145°F - 32°F = 113°F, 113°F/4hrs = 28.25°F/ hr