In 1940, the population density of Philadelphia was given by 60 $e ^ { - 0.4 }$ thousand people per square mile at a distance t miles from City Hall. How many people lived between 1 and 3 miles from City Hall?
Enter just an integer (no words) representing the number to the nearest thousand.

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The Answer of In 1940, the population density of Philadelphia was given by 60 $e ^ { - 0.4 }$ thousand people per square mile at a distance t miles from City Hall. How many people lived between 1 and 3 miles from City Hall?
Enter just an integer (no words) representing the number to the nearest thousand.

In 1940, the Population Density of Philadelphia Was Given by 60