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A kiln heats from 20 to 1,200 degrees in 6 hours. What is the average heating rate?

  • A.about 120 degrees an hour
  • B.about 20 degrees an hour
  • C.about 197 degrees an hour
  • D.about 200 degrees an hour

Answer: C

The rise of 1,180 degrees over 6 hours is about 197 degrees an hour. Real schedules vary the rate considerably, so the average conceals holds and slow passages through critical ranges. An average rate conceals almost everything that matters in a schedule.

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