If a time zone is standardized to $75^ ext{circ}$ W longitude, and a local measurement shows solar noon occurs 20 minutes later than official clock noon, what is the location's approximate longitude?
Answer
$80^ ext{circ}$ W
Since the Earth rotates $15^ ext{circ}$ per hour, every four minutes corresponds to one degree of longitude. A 20-minute delay means the location is $20 / 4 = 5^ ext{circ}$ west of the standard meridian. Therefore, $75^ ext{circ} ext{ W} + 5^ ext{circ} = 80^ ext{circ} ext{ W}$.
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