When a bowl of hot soup is left in a room, the soup eventually cools down to room temperature. The temperature 7 of the soup is a function of time t. The table below gives the temperature (in °F) of a bowl of soup t minutes after it was set on the table. t (min) T (°F) t (min) T (°F) 0 251 35 106 5 225 40 95 10 200 50 86 15 177 60 79 20 155 90 73 25 30 136 118 Find the average rate of change of the temperature of the soup over the first 20 minutes and over the next 20 minutes. 120 150 70 70 first 20 minutes next 20 minutes °F/min °F/min During which interval did the soup cool off more quickly? the first 20 minutes the second 20 minutes neither

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