How could you explain the time change from the eastern coast of the United States to the western coast of the United States in terms of integers?
1) If the eastern coast is at 12 PM, the western coast will be at 9 AM
2) If the eastern coast is at 12 PM, the western coast will be at 3 PM
3) If the eastern coast is at 12 PM, the western coast will be at 6 PM
4) If the eastern coast is at 12 PM, the western coast will be at 12 AM