### Home > MC1 > Chapter 9 > Lesson 9.3.3 > Problem 9-151

**Unit rate** is defined as rate with a denominator of

, so she ran

In addition, the number of seconds it takes her to run each meter can be calculated as , so it took her

An ice skater covered

meters in seconds. Find his unit rate of speed in meters per second. meters per secondA train in Japan can travel

miles in hours. Find the unit rate of speed in miles per hour. Follow the steps in part (a) and in the example above.

Alaska has a very low population density. It only has

people in square miles. Find the unit rate of density in terms of people per square mile. About

people per square mile. New Jersey has a very high population density. It has

people per square mile. If Alaska had the same population density as New Jersey, what would be the population of Alaska? Solve with a proportion. (By the way, there were about people in the United States as of the year 2009.)