The figure below shows the graph of the rate of change in temperature of a metal

Question

The figure below shows the graph of the rate of change in temperature of a metal plate (in degrees Celsius per hour) during an industrial process where t is the time in hours. Determine the time t at which the temperature is at a maximum and the time t at which the temperature is at a minimum during this process. The temperature is at a maximum at t = 5: the temperature is at a minimum at t = 8. The temperature is at a maximum at t= 3: the temperature is at a minimum at t = 6. The temperature is at a maximum at t = 7: the temperature is at a minimum at t = 5. The temperature is at a maximum at t = 5: the temperature is at a minimum at t = 7. The temperature is at a maximum at t = 3 and at t= 9: the temperature is at a minimum at t=9.

Explanation / Answer

Option D is correct.

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