Convert measurements within a system and use unit reasoning to choose the correct scale.
Convert a measurement for a story problem
Problem
A hiking trail is \(2~\text{miles}\) long. The park map lists distances in feet. How many feet long is the trail?
Big Picture
What this problem is really about
The map’s requested unit determines the conversion direction. Multiply the trail length by a feet-per-mile ratio so miles cancel, account for every mile rather than using the one-mile factor alone, and carry feet into the result. A scale check should confirm that several miles become many thousands of the smaller unit.
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