Answer: 111.1 square mile.
Explanation:
Given: In 2010, the population of Salt Lake City, Utah =186,440
The population density = 1,678 people per square
We know that for a particular area , the formula to find the population density is given by :-

Now, the the population density of Salt Lake City is given by :-

Hence, the of area Salt Lake City's land in 2010 = 111.1 square mile