While visiting Venice, Emily sees a sign that St. Mark's Square is 1,500 meters ahead. She wonders how long it will take her to
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plain and short, an hour has 60 minutes, and a minute has 60 seconds, therefore an hour has 60*60 or 3600 seconds, and we can express that rate as hr/3600s or the other way around 3600s/hr, depending on which version we need.
a mile has 5280 feet, again, we can use that rate as mile/5280ft or 5280ft/mile, as needed.