When multiplying conversion factors, make sure the only remaining units are the desired units.
115mi/h
Practice makes perfect
We want to express 607 200 feet per hour in miles per hour.
607 200 ft/h= mi/hThis means that we need to change feet per hour into miles per hour. To do so, we will use the fact that 1 mile is equal to 5280 feet. Let's write this relationship as a unit ratio.
5280 ft/1mi
To perform the conversion, we need to multiply the speed in feet per second by the unit ratio or its reciprocal. Remember, we want to arrange these ratios such that every unit we do not want gets canceled out, and only the units that we want will remain.
We found that the speed is equal to 115 miles per hour.
Extra
Common Conversion Factors
Use the following tool to explore some of the most commonly used conversion factors. Conversions can be made both within or between the metric system and the imperial system, also known as the U.S. Customary System.
Around the world, people use conversion factors on a regular basis. You can read more about some practical applications of conversion factors in our original content.
