A steel bar is heated in a furnace until it reaches 2000°F. The blacksmith observes that it cools to 1500°F in 15 minutes. It needs to be hammered into shape before it gets within 500°F of the room temperature (100°F) before it gets too cold to be shaped properly. After pulling out the steel bar from the furnace, how long does the blacksmith have before it needs to be reheated? Assume that Newton's law of cooling is applicable. O 101.8 min O 76.5 min O 56.6 min O 65.6 min

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