Final answer:
Approximately 30 degrees of longitude are between New York City and Denver.
Step-by-step explanation:
The distance between New York City and Denver is approximately 30 degrees of longitude. The Earth's longitude is divided into 360 degrees, with the zero meridian passing through Greenwich, England. As you travel from east to west, longitude values increase. Therefore, New York City, located on the east coast of the United States, has a lower longitude value compared to Denver, which is located more towards the west.