2. Convert 2,640 feet to miles.
3. Convert 72 degrees Fahrenheit to degrees Celsius.
4. Convert 20 mph to miles-per-hour.
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5. Convert 70 miles-per-hour to kilometers-per-hour.
6. Convert one quart of milk to ounces of milk.
7. Convert 1 BTU (British Thermal Unit) to Joules.